Features Versatility TENS Machine: The massager machine combines 3 pre-programmed massage modes, provide precise control to relieve muscle pain and alleviate body soreness. And the Tens therapy machine built-in rechargeable lithium battery ensures continuous use up to 24 hours Moreover, the muscle stimulator has 6 adjustable intensity levels which penetrate muscle groups deeper than human hands can. Steady Pulse Function: We found many guests wish to own a tens massager with a continuous pulse setting, so in this tens device mode 1 & 2 provide steady constant pulse and you could experience the constant massage feeling. It is more comfortable for relaxation, perfect for using when working or houseworking. Specifications: * 2 output channels * New circuitry, no cross over, no interference * Continuous, intermit, and dense-disperse (modulated) waveforms * Adjustable frequency: 1-100Hz * Durable alligator clip wires * Timer: 0-60 minutes * Output safety alert - all outputs must be turned off before powering on the unit. Technical specs: * Output pulse amplitude: 0-50V (on 500Ω load). Adjustable * Pulse frequency continuous wave - 1-100 Hz Adjustable * Intermittent wave: continuous wave frequency adjustable in 1-100Hz. Break-wave time is 5 seconds, continuous wave time is 15 seconds * Dense-disperse wave spacing wave frequency is of density frequency, Density wave frequency adjustable in 5 - 100Hz. * Pulse width: 1ms * Pulse wave un-symmetry two-direction pulse wave * Wave form: adjustable, dense-disperse, and intermittent * Power source: DC 9V, or A/C adapter What's in the box: * 2 connecting pin lead wires * 2 pairs alligator clips to connect to the pin lead wires * 2 pairs self-adhesive electrodes to connect to the pin lead wire * 1 instruction manual