Brand new and high quality<br />Look no further, buy one now!<br />Dimensions: 46 x 35 x 11mm<br />Input voltage: 2.6-4.2V<br />Output voltage: 5V 500MA<br />Charging end voltage: 4.2V<br />Discharge end voltage: 2.6V ( it is suitable for common lithium-ion batteries, such as the common 18650 )<br />Conversion efficiency: 80% @ input 3.7V output 5v 500mA<br />Charging current (MAX): 700MA @ BAT = 2.8V<br />It inputs charging voltage  by MICRO USB and matches with most mobile phone chargers.<br />It outputs voltage through a standard  A type USB output hole, suitable for most situations powered via USB.<br />Its circuit structure is divided into three parts: 1. IC and a MOSFET are in charge of battery management, preventing the battery from overcharge or over discharge. 2.BOOST circuit is responsible for increasing the voltage. 3. Simple current limiting and unidirectional power device to charge the battery. It has the perfect protection features, such as short-circuit protection.<br />If the load and charging are going on at the same time, and need to work long hours, you need to reduce the current.<br />Please note the meaning of the symbols on the PCB, can not occur an error when connecting, if on the contrary, it will damage the product.<br />B + = Battery positive<br />B- = Battery negative<br />1 x Voltage boost module<br /><img src="//agdetail.image-gmkt.com/m430/004/710/620710004/img/agdetail.image-gmkt.com/004/710/620710004/img/img6.eachbuyer.com/x9/p100/bn371_1.jpg" />                                                        <img src="//agdetail.image-gmkt.com/m430/004/710/620710004/img/agdetail.image-gmkt.com/004/710/620710004/img/img6.eachbuyer.com/x9/p100/bn371_2.jpg" />                                                        <img src="//agdetail.image-gmkt.com/m430/004/710/620710004/img/agdetail.image-gmkt.com/004/710/620710004/img/img6.eachbuyer.com/x9/p100/bn371_3.jpg" />                                                        <img src="//agdetail.image-gmkt.com/m430/004/710/620710004/img/agdetail.image-gmkt.com/004/710/620710004/img/img6.eachbuyer.com/x9/p100/bn371_4.jpg" />