This rectangle crystal lamp has a battery, so it can be as a bedside lamp. When it is fully charged, it can stand in the light mode 10 hours or support up to 10 hours music play back. When the power is low, the Bluetooth connection will disconnect, the bedside light will have voice prompts, if you sleep at night, please charge in advance and turn off the phone’s Bluetooth, so as not to wake you. It wireless design allows hassle free connectivity with all Bluetooth enabled devices.