If you have a modern smart phone you may have noticed that it comes with built in wireless charging capability called 'Qi charging.' Qi is a trademark name for a thin and smart inductive charging system. Many large gadget companies have standardized on Qi, which means it's easy to find a charging dish and they thought it might be cool if your Raspberry Pi project or cell phone with a microUSB port can recharge itself wirelessly. Thus, they now have four different MicroUSB Modules for different phone orientations.
- Output Voltage: DC5V
- Output Current: 600mA Max
- Max Power Transmission: DC 5W
- Operating Frequency: 100-200Khz
- Conversion efficiency: >70%
- Charging distance: 2-6mm
- Weight Weight: 25g
As of Monday, April 27th, 2015 the cable length is 60mm.