Here is a tutorial video describing the different button on the device:
OrCam Read Buttons
Power Button.
The power button is the thin, oval-shaped button, located near the charging inlet. Use the power button to power the device and enter the audio settings menu.
Trigger Button.
The trigger button is the circle-shaped button, located near the front of the device, above the camera. The majority of functions are performed with the trigger button.
Volume Buttons.
The volume buttons are embossed plus (“+”) and minus (“-”) buttons that are located near the trigger button. Several functions are performed with the volume buttons.
LED Indicators.
Battery LED Indicators.
There are 4 blue LED lights next to the power button. Each light represents up to 25% of available battery.
On/Off LED Indicator.
The On/Off LED Indicator is the small, OrCam logo-shaped light located on the bottom of the device. This light will turn orange as the device boots up, and change to blue upon fully awakening.