ES-420 is a low-frequency electrotherapy unit with essential stimulation modes
Number of Channels: 2 channels
Current modes: TENS, EMS and Microcurrent.
Timer: 1-99 minutes.
Power supply: AC adaptor or six alkaline batteries, DC 9V
Independently controllable channels.
AC/DC dual power supply
18 preset programs and up to 6 programs may be stored.
A full range safety function with self-test, keyboard lock, emergency stop button, output cut off in the event the output increases abruptly and low battery indication.