1. Belifu Dual Channel Muscle Stimulator & Pulse Massager Tens Unit. Overall Score: 9.8. 2. NueMedics Rechargeable Muscle Stimulator Device & Pulse Massager Tens Unit. Overall Score: 9.7. 3. Kedsum Rechargeable Muscle Stimulator. Powerful Battery. The NURSAL TENS Unit Rechargeable Electronic Pain Relief Massager uses a rechargeable lithium battery. It can provide around 10 hours of continuous use with ease. The batteries are exceptionally long-lasting, and the device does not need to be charged frequently. Even so, the process of charging is also very convenient. Sorry, we have detected unusual traffic from your network. Please slide to verify. Feedback ID USB Cable - Mini $ 9.99. Additional information Description. Please select the USB cable that fits your massager device! Additional information. Weight: 0.1 lbs: Related products. Magic Massage Socks $ 39.99. Magic Massage Socks. Add to cart; Magic Massage Ultra 1610 Magic Massage Online Manual;