This wireless charger transmitter is a high power wireless charger. This module can be used as wireless charger for tablet PC, smart phone, Bluetooth speaker,etc.Features: Work Voltage ：DC 18-19 V Wireless Output Voltage ：5V Wireless Output Current ：1.5-2A Wireless Output Power ：7-10W Resonant Frequency ：140KHz Charging efficiency ：>70% TX to RX space ：2-6mm Specification: Charging indicator function: When no-load state led becomes green. When charging state led becomes red.(This function can be selected) Current protection: When input current is more than 1A, the circuit will be turned off automaticly. 12bits AD Battery can be filled more than 95%. High efficiency: can transmit 1500ma current.