Power ON/OFF No need to worry about the draining car battery anymore. Just long press CH button for 2 sec to turn it on and long press for 3 sec to turn it off.\r\n \r\nStrong Compatibility Compatible with phones, tablets and any Bluetooth enabled devices, as well as cars, trucks and other 12-24V vehicles.\r\n \r\nGuidance for LED Ring Light Double press CH button to turn on/off the blue LED ring light. The blue LED ring light will flash for Bluetooth pairing after power on, and it will stay on after successful pairing. However, it will turn off if it’s unconnected in 5 min and keep waiting for pairing.