Input voltage: DC5V 0.5~0A, if it exceeds this voltage range, it will alarm and stop charging Over temperature protection: when the temperature is higher than 60 degrees, It will automatically stop charging for 1 minute, then the temperature drops, and it will recharge. Overcurrent protection: When the current exceeds 2A, it will automatically stop charging to avoid damage to electrical equipment. and high quality Standby power: average power is less than 50 mW; Conversion efficiency: greater than 73% Transmission distance: maximum 10mm, recommended transmission distance 2mm~8mm size:Coil size 29x41x0.35mm, total length is about 112mm Material:copper colour:Black+copper Package Contents: 2 x Wireless charging module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.