The Pulse™ Tens Unit by ProActive™ is clinically proven to relieve pain without drugs. Tens devices rely on small electrical impulses delivered by electrodes that can be an effective way to manage pain. ProActive Tens provides drug-free pain management for nerve related conditions such as lower back pain, sciatic nerve pain, arthritis pain and many other nerve related pain conditions. This black Tens machine includes a stimulator, lead wires and electrodes. The stimulator emits a small amount of electric current that travels through the wires to the electrodes which in turn transmit it through the skin and to the underlying nerves. The Pulse™ Tens also allows the user to personalize the pulse frequency and length with 3 convenient settings. Package includes 1 Tens machine, durable carrying case, 2 lead wires, 4 gel electrodes, 1 - 9 volt battery and illustrated instructions. The Pulse™ Tens Unit by ProActive™ is the drug-free way to relieve your pain. Model # 715-420