The Twin Stim 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 * Five TENS Modes: Burst / Normal / Modulation / SD1 / SD2 * Two EMS Modes: Synchronous Alternate * System includes device lead wires four self-adhesive reusable electrodes 9-volt battery hard plastic carrying case and instruction manual * Patient compliance meter can store up to 60 sets of operation manual * Power Source: 9-volt battery * Pulse Width: 50-300 s adjustable * Pulse Rate: 2-150 Hz adjustable * Pulse Ramp: 1-8 seconds * Pulse Amplitude: 100 mA peak into 500 phm load * Contraction Time: 2-90 seconds * Relaxation Time: 2-90 seconds * Wave Form: Asymmetrical Bi-Phase Square Pulse * Timer: 1-60 minutes or continuous * One year warranty