How to Use: 1. Control the light switch and color through the switch on the back of the product 2. USB charging Specification: Item Type: Mahjong Night Light Material: ABS Battery: Built in one polymer lithium battery, capacity 500mAh (included) Light Source: 2 yellow and 2 white LED soft light beads Rated Power: 2W Input: 5V-1A Charging Time: 2 ho..