Handheld Digital Oxygen Detector USB Rechargeable O2 Sensor Tester Monitor LCD Display Adjustable Alarm Power Off Oxygen Meter
1) Power On / Off button.
2) Increase / sound button.
3) Temperature unit selection.
4) Decrease button.
5) Mode selection button.
6) Alarm led indication.
7) Battery charge indication.
8) Buzzer sound holes
9) LCD display.
10)Gas sensor with cover.
11) Battery door.
12) Battery charge jack hole.
