It's all adopt tps40057 chip and is the only safe and efficient.
40057 chip protection mechanism, the output voltage is zero.
Efficient, synchronous rectifier way, efficiency is as high as 94% above.
All copper plate and excellent performance, four USB is all of brass.

Specifications:

Name: USB Step-down Power Supply
Material: Tps40057 chip and copper
Dimensions:37 * 47 * 18mm
Current: 5 A maximum

Function:

All equipment for 5v, appliances within 25 w, such as MP3, MP4, 't a MP5, cell phone, tablet, navigation,
Vehicle traveling data recorder, and a bluetooth device, can use at the same time,
also be used on the LED power supply.
The power connect between the cathode and anode, input is completed,
There will be a voltage output.And with two USB output will be normal work, provide standard 5 v,
Used for all kinds of electrical appliances
USB socket provide standard 5 v voltage, directly.USB plug in the USB socket, then can be used.
It's all adopt tps40057 chip and is the only safe and efficient.
40057 chip protection mechanism, the output voltage is zero.
Efficient, synchronous rectifier way, efficiency is as high as 94% above.
All copper plate and excellent performance, four USB is all of brass.