Here is a tutorial video describing the different button on the device:
OrCam Read Buttons
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.
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.
The volume buttons are embossed plus (“+”) and minus (“-”) buttons that are located near the trigger button. Several functions are performed with the volume buttons.
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.