Twin Stim IV Portable TENS Unit | Rechargeable TENS + NMES Device
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InTENSity Twin Stim IV TENS/NMES Unit – DI2717
The InTENSity Twin Stim IV DI2717 is a rechargeable, dual-channel electrotherapy unit combining TENS and NMES stimulation in one portable device. Designed for prescription use under the direction of a qualified healthcare professional, the Twin Stim IV provides preset body-area programs plus manually adjustable settings for treatment plans that require sensory-level TENS, muscle-stimulating NMES, or access to both modalities from a single unit.
With 36 program selections, independent intensity control for two channels, a large LCD, rechargeable lithium-ion battery, electrode-load detection, and treatment-use tracking, the Twin Stim IV offers substantially more programming flexibility than a basic TENS unit while remaining compact enough for portable clinical or home use.
Model: DI2717 GTIN-14: 00092237614143 UPC: 092237614143 Channels: 2 Modalities: TENS + NMES Power: Rechargeable lithium-ion battery U.S. status: Prescription device
Why Choose the InTENSity Twin Stim IV?
The Twin Stim IV is designed for users who need both TENS and NMES without moving to a larger multi-modality electrotherapy system.
TENS + NMES in One Device
TENS and NMES use electrical stimulation for different treatment objectives. The Twin Stim IV places both modalities in one two-channel unit, allowing a clinician-directed program to use either mode without requiring separate devices.
For a detailed explanation of how these modalities differ, see our TENS vs. NMES guide.
36 Program Selections
The Twin Stim IV combines preset and manually adjustable programming across six body areas:
- Neck
- Shoulder
- Hand
- Low back
- Knee
- Foot
Each body-area selection provides programmed treatment options plus a customizable U1 setting, giving the device 36 total TENS/NMES program selections.
Two Independently Controlled Channels
Two isolated output channels allow the Twin Stim IV to operate with one or two electrode pairs. Channel 1 and Channel 2 intensity are adjusted independently, making it easier to accommodate different electrode locations or stimulation requirements within the prescribed treatment setup.
Rechargeable Portable Design
The integrated rechargeable lithium-ion battery eliminates the need to continually replace disposable batteries. The compact unit also includes a belt clip and carrying case for convenient storage and transport.
Treatment Tracking
A built-in patient compliance meter records treatment-use information, providing an additional tool for prescribed home electrotherapy programs where treatment history may be useful to the supervising clinician.
Twin Stim IV Specifications
| Specification | InTENSity Twin Stim IV DI2717 |
|---|---|
| Modalities | TENS and NMES |
| Number of channels | 2 isolated channels |
| Program selections | 36 total |
| Body-area selections | Neck, shoulder, hand, low back, knee, foot |
| Output waveform | Biphasic square pulse |
| Output amplitude | 0–100 mA at 1,000 Ω |
| TENS pulse rate | 1–150 Hz |
| TENS pulse width | 50–400 µs |
| NMES pulse rate | 1–100 Hz |
| NMES pulse width | 200–400 µs |
| Treatment timer | 5–90 minutes |
| Intensity controls | Independent Channel 1 and Channel 2 |
| Display | Large LCD |
| Power source | Rechargeable 3.7 V lithium-ion battery |
| Electrode-load detection | Yes. |
| Patient compliance meter | Yes. |
| Model / SKU | DI2717 |
| GTIN-14 | 00092237614143 |
| UPC / GTIN-12 | 092237614143 |
| U.S. sale status | Prescription use |
Twin Stim IV vs. Other TENS/NMES Units
Choosing an electrotherapy unit should be based on the modalities, number of channels, programming flexibility, and treatment requirements prescribed by the healthcare professional.
| Device | Channels | Modalities | Power | Best Fit |
|---|---|---|---|---|
| InTENSity Twin Stim IV DI2717 | 2 | TENS + NMES | Rechargeable lithium | TENS and NMES in a compact two-channel unit |
| InTENSity Select Combo II | 2 | TENS, NMES, IFC, Russian | Rechargeable | Users who also require IFC or Russian stimulation |
| Chattanooga Primera TENS/NMES | 2 | TENS + NMES | 9V battery | Chattanooga two-mode TENS/NMES platform |
| Twin Stim Plus DS5402 | 4 | TENS, EMS/NMES, IFC, Russian | AA batteries / AC adapter | Four-channel treatment and additional stimulation modes |
When the Twin Stim IV Makes the Most Sense
The Twin Stim IV is a strong choice when the prescribed treatment requires:
- Both TENS and NMES
- Two output channels
- Rechargeable operation
- Preset body-area programming
- Manually adjustable stimulation parameters
- A compact, portable format
If the treatment plan requires interferential current or Russian stimulation, consider the InTENSity Select Combo II. If four channels or up to eight electrodes are needed, compare the Twin Stim Plus DS5402.
What's Included with the Twin Stim IV?
| Included Item | Quantity |
|---|---|
| InTENSity Twin Stim IV DI2717 | 1 |
| Reusable 2" × 2" electrodes | 4 |
| Lead-wire sets | 2 |
| Rechargeable lithium-ion battery | 1 |
| Charging equipment | 1 set |
| Carrying case | 1 |
| Instruction manual | 1 |
| Quick-reference guide | 1 |
Replacement Electrodes for the Twin Stim IV
The Twin Stim IV uses reusable self-adhesive electrodes connected through its lead wires.
For direct replacement options, see:
- InTENSity 2" × 2" White Cloth Electrodes
- Balego TENS, NMES & FES Electrodes
- All Electrotherapy Electrodes
Electrode size, placement, and configuration should follow the device instructions and the treatment plan established by the prescribing or supervising healthcare professional.
Twin Stim IV Setup & Troubleshooting
For operating instructions, program selection, charging, intensity controls, electrode connection, safety-lock behavior, compliance-meter functions, and common troubleshooting steps, see our dedicated InTENSity Twin Stim IV setup and troubleshooting guide.
Keeping those instructions in the dedicated resource guide allows this product page to focus on device selection, specifications, accessories, and purchasing information.
Frequently Asked Questions
Is the InTENSity Twin Stim IV the DI2717?
Yes. DI2717 is the model and manufacturer SKU for the InTENSity Twin Stim IV TENS/NMES unit. Its single-device GTIN-14 is 00092237614143.
Does the Twin Stim IV provide both TENS and NMES?
Yes. The Twin Stim IV combines TENS and NMES stimulation in one two-channel device.
Is the Twin Stim IV an OTC TENS unit?
No. The DI2717 is identified in FDA device records as a prescription-use device rather than an over-the-counter device. U.S. purchasers should follow applicable prescription requirements.
How many programs does the Twin Stim IV have?
The unit provides 36 program selections across its TENS and NMES modes, combining preset body-area programming with manually adjustable U1 selections.
Can I manually adjust the Twin Stim IV?
Yes. In addition to its programmed selections, the Twin Stim IV provides manually adjustable parameters through its U1 programs. Adjustments should remain consistent with the prescribing professional's instructions and the manufacturer's directions for use.
How many electrodes can be connected?
The Twin Stim IV has two output channels. Each channel uses a lead-wire pair and normally operates with two electrodes, allowing four electrodes to be connected when both channels are used.
Are electrodes included?
Yes. The standard kit includes four reusable 2" × 2" electrodes along with two lead-wire sets.
Is the Twin Stim IV rechargeable?
Yes. DI2717 uses a rechargeable lithium-ion battery and includes charging equipment.
Does it provide interferential or Russian stimulation?
No. The Twin Stim IV is a TENS/NMES device. If the prescribed treatment requires IFC or Russian stimulation, compare the InTENSity Select Combo II or four-channel Twin Stim Plus DS5402.
Where can I find operating instructions?
See Balego's Twin Stim IV manual and setup and troubleshooting guide for detailed operating information.
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FAQs
What is the Twin Stim IV Portable TENS Unit?
The Twin Stim IV is a rechargeable portable electrotherapy device that combines TENS and NMES in one dual-channel unit.
Is the Twin Stim IV only a TENS unit?
No. It includes both TENS and NMES. TENS is used for sensory stimulation, while NMES is used to produce muscle contraction.
What is the SKU?
The SKU is DI2717.
How many channels does it have?
The Twin Stim IV has two isolated output channels.
How many programs does it include?
It includes 36 total programs: 18 TENS programs and 18 NMES programs.
What body-part presets are included?
The device includes presets for neck, shoulder, hand, low back, knee, and foot.
Can I manually adjust the settings?
Yes. The U1 manual programs allow adjustment of key TENS and NMES settings.
What is the difference between TENS and NMES?
TENS primarily provides sensory stimulation for pain-management workflows. NMES stimulates motor nerves to produce muscle contraction for clinician-directed muscle stimulation programs.
Does the Twin Stim IV use rechargeable batteries?
Yes. It uses a 3.7V rechargeable lithium-ion battery pack.
Can I use the Twin Stim IV while charging?
No. Do not use the device while it is charging.
How long does charging take?
A full charge may take several hours. Plan to charge the unit between sessions.
What electrodes come with the device?
The kit includes four 2" x 2" electrode pads.
When should I replace electrode pads?
Replace pads when they no longer stick well, become dirty or dry, or stimulation feels weak, sharp, or uneven.
What does the electrode load indicator do?
It helps identify poor electrode contact or lead-wire connection problems.
Does the device track treatment use?
Yes. The device includes compliance or treatment-use tracking for reviewing use history.
Is Twin Stim IV Rx only?
Yes. It is Rx only and should be used under appropriate professional direction.
Does Balego sell replacement electrodes?
Yes. Balego offers replacement electrotherapy electrodes and related TENS/NMES accessories.
Is Twin Stim IV better than a basic TENS unit?
It depends on the need. Twin Stim IV is better when both TENS and NMES are needed. A basic TENS unit may be enough when the user only needs TENS.
Is Twin Stim IV better than InTENSity Select Combo II?
They serve different needs. Twin Stim IV includes TENS and NMES. InTENSity Select Combo II adds additional modes such as interferential and Russian stimulation.
Does Balego offer free shipping?
Yes. Balego lists free shipping across the USA for this product.
Does Balego offer a best-price guarantee?
Yes. Balego states that it will match competitor pricing when customers show a competing offer.
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Twin Stim IV Manual: Setup, Unlock & Troubleshooting
The InTENSity Twin Stim IV is a dual-channel portable electrotherapy device offering customizable and body-part-specific TENS (pain relief) and NMES (muscle stimulation) settings. To operate or troubleshoot the unit, charge its 3.7V lithium-ion battery via the included USB cord; if the device suddenly turns off, it typically indicates a depleted battery or the completion of its set treatment timer. For safety, the device automatically triggers an automatic lock after 30 seconds of inactivity to prevent accidental parameter shifts—simply press the Down (▼) arrow button to unlock it. During setup, ensure lead wires are securely plugged in and electrodes are firm against clean skin; if the unit displays an electrode warning or fails to deliver stimulation, check for dried gel, damaged lead wires, or loose pad connections. Finally, clinicians and users can track total usage time via the built-in compliance meter to ensure consistent, recommended therapy sessions.
Twin Stim IV Powers Off After 20 Seconds? Unlocking, 0 mA & Output Troubleshooting
If your InTENSity Twin Stim IV DI2717 seems to power off or stop responding after about 20 seconds, the unit may not actually be shutting down.
TENS vs. NMES: What’s the Difference, and Which Do I Need?
TENS and NMES use skin electrodes for different treatment goals. Learn how purpose, muscle response, and device controls affect the choice, with examples from our catalog.