PRODUCT DESCRIPTION The Twin Stim OTC Edition is an exact combination of our TENS 7000 and EMS 7500, which gives the user the choice of five Modes of TENS and two Modes of EMS. Features include, dual channels, seven modes, timer, patient compliance meter, new stronger 100 mA output, safety amplitude cover, sturdy metal belt clip and rubber side railings for maximum handling. Use the tens unit as an electric massager pain relief device and then use the EMS side for muscle rehab. There are many uses for our device including neuropathy pain relief for feet, nerve pain relief, back relief, neck pain, or as just a muscle stimulator for pain relief. From the makers of the TENS 7000 2nd Edition Digital TENS unit with accessories MANUFACTURER CONTACT INFORMATION 1-Year warranty with technical support. TENS units are complex electrical devices. We have a dedicated Consumer Therapy Support team that can help troubleshoot, answer your TENS related questions, and get you back up and running. They can even do warranty replacements if needed. I encourage you to give our Consumer Therapy Support Team a call at 800.871.7858 (x640 or x606) should you need help with your new TENS device.