Dispatched Withing 24 Hours. Wireless power supply technology(wireless charging) allows the receiver only across the air, paper or plastic housing can achieve the transmission of electrical energy, indeed greatly facilitate the application. Specification: Input voltage: DC 5V - 12V Input current: 100mA - 500mA Output voltage: DC 5V Output current: 500mA - 600mA Output power: 2.5W - 4W Center resonant frequency: 125KHz Feature: Emission coil and receive coil distance for 1mm ~ 20 mm, if small current work can be appropriately increase receiving coil turns to increase transmission distance Test data, for reference: Emission coil: copper wire diameter ?0.6 mm, coil diameter 40 mm, around 20 turns Receiving coil is same Emission coil grafted in 12V power supply: standby working current 300mA, load is 4.2V 800mAH polymer lithium battery Distance    Output voltage    Charging for 4.2V lipo battery current 1mm              5V                       600mA 2mm              5V                       450mA 3mm              5V                       360mA 4mm              5V                       310mA 5mm              5V                       240mA 6mm              5V                       210mA 7mm              5V                       162mA 8mm              5V                       150mA 9mm              5V                       132mA 10mm            5V                       120mA 11mm            5V                       110mA 12mm            5V                       70mA 13mm            5V                       54mA 14mm            5V                       41mA 15mm            5V                       28mA 16mm            5V                       19mA 17mm            5V                       17mA 18mm            5V                       10mA If receiving distance increase it's need to add the coil turns. In practical application, it can change the turns
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