usb plug specifications size,DMI larger 10.5×2.5 mm,USB interface 12X5mm. For example, Micro-USB connectors are smaller than standard USB and Mini-USB connectors, saving space, with up to 10,000 plug and unplug life and strength, blind plug structure design.
The Micro-USB standard supports the current OTG functionality of USB, that is, in the absence of a host (such as a personal computer), portable devices can be directly transferred between data, compatible with USB1.1(low speed :1.5Mb\/s, full speed :12Mb\/s) and USB2.0(high speed :480Mb\/s), while providing data transfer and charging Electricity.
3USB- 2.4A, this writing is the total current peak, generally 5V, USB so the total power should be 12 watts, suitable for small Bluetooth device charging, such as Bluetooth headset flashlight, not suitable for today's mobile phone charging, the output power is too low charging is slow, now a mobile phone fast charge is much more than 12 watts, let alone charging the charging treasure will be slower.