Power supply voltage: DC 6V (1 dry battery 4 or external power adapter) Output pulse waveform: asymmetric bi-directional pulse waveforms Output mode: continuous, sparse, intermittent Continuous wave frequency: 0~100Hz; continuous wave frequency adjustment: potentiometer continuous adjustment Intermittent sparse-dense modulation frequency: 10 times / min; intermittent continuous wave frequency: adjustable; sparse dense wave frequency: adjustable Output pulse width: 0.5ms Number of Outputs: 4 outputs when the divide-and-merge switch is set to "divide"; the 2nd and 3rd outputs when the divide-and-merge switch is set to "1+2" or "3+4"; the 1st and 4th outputs have enhanced outputs; the 1st and 4th outputs have enhanced outputs; the 1st and 4th outputs have enhanced outputs. When the split-parallel switch is set to "1+2" or "3+4", the 2nd and 3rd roads have enhanced output and the 1st and 4th roads have no output. Output pulse peak-to-peak voltage: greater than 20V and less than 70V for 250Ω load resistor; greater than 40V and less than 140V for 500Ω load resistor. Output blocking: any * output strength is not set "OFF" start power alarm indicator lamp flashes, automatically cut off the output Overall dimensions: length × width × * 230mm × 160mm × 75mm Accessories: millipoint electrode clip × 4 external power adapter × 1 skin electrodes 2 sets of