Digital Tuner

ON button. If to hold the button 1 sec, turn the screen off/on. Momentary press select tunning item: Chromatic, Guitar, Bass, Violin, Ukulele. Default position is Chromatic.
If no wave at the input or a wave is out of the range, screen will turn off in two minutes. If it happened just press ON button 1 sec to turn the screen on.
Two inputs are multiples to use the wave further.
Power consumption: V+ 5mA, V- 0mA.

http://l-1.su/Tuner2.html