... , it can work for a very long time. The white light can be used as a reading lamp, and the red ... light flashes to give an alarm. Feature:Size: 19XΦ8 cm; ... : Self- lock switch in three steps: 1. White light; 2. Red warning flashing light. 3. Off. Function: 1. Waterproof 2. Charged in ... Water in the cup to balance it) 4. The red light can flash, with alarm function