Mini Stim Nerve Stimulator Based on the original MS-1 design the new MS-1B includes low battery detection FET based output circuitry and enhanced battery compartment. Includes: EL-2MTP (2' extension leads) DP-MTP (Diagnostic Probe) Carrying Case Details and Specifications Twitch: 2 pulses per second Tetanus: 50 pulses per second Output Current: 30 milliamperes maximum Stimulus Pulse: 0.25 milliseconds, square wave monophasic Power: 7.5V alkaline battery Case: Durable ABS plastic Size: 2.5" x 1.25" x .875" Weight: 3 oz (85 gm) Warranty: 2 years