Features: _x000D_ 100% brand new and high quality. _x000D_ This is a DC-DC boost converter module with working frequency of 1 MHz._x000D_ _x000D_ The module has high efficiency up to 94%, usually can be 84%~91%. _x000D_ Ultra small size and light weight, it is convenient to use. _x000D_ _x000D_ Widely used for battery-powered devices, multimeter, small power motors, cameras, electric toys, model aircraft, LED lighting, electronic DIY kits, etc. _x000D_ _x000D_ _x000D_ Specification:_x000D_ _x000D_ Output voltage: 3.7V, 5V, 12V (Optional) _x000D_ Efficiency: 94% (usually is 84%-91%)_x000D_ Quiescent current: 0.19mA_x000D_ Operating temperature range : -40~+85 Degrees Celsius_x000D_ Storage temperature range : -65~+150 Degrees Celsius _x000D_ Size: 13*11*5.2mm / 0.5*0.4*0.2in _x000D_ Weight: 2g / 0.1oz (approx.) _x000D_ _x000D_ Protection : _x000D_ Over current protection(OCP)_x000D_ Over voltage protection(OVP)_x000D_ Short circuit protection(SCP)_x000D_ Over temperature protection(OTP) _x000D_ _x000D_ Pin description:_x000D_ Vi : Input positive(+)_x000D_ GND : Input and Output negative(GND/-)_x000D_ Vo : Output positive(+)_x000D_ _x000D_ Output 3.7V :_x000D_ Input voltage: DC 2.6 - 3.6V_x000D_ output voltage: DC 3.7V3%_x000D_ Maximum output : 3.7V/1200MA(See the table below for details)_x000D_ _x000D_ Output 5V :_x000D_ Input voltage: DC 2.6 ~ 4.5V _x000D_ Output voltage: DC 5V3%_x000D_ Maximum output : 5V/1200MA _x000D_ _x000D_ Output 12V :_x000D_ Input voltage: DC 2.6 ~ 6V _x000D_ Output voltage: DC 12V3%_x000D_ Maximum output : 12V/500MA _x000D_ _x000D_ _x000D_ _x000D_ Package list:_x000D_ 1 * Module _x000D_ _x000D_ _x000D_ Note:_x000D_ This is a DC - DC voltage converter module, please pay attention when using:_x000D_ 1, The input voltage should not be higher than maximum input range._x000D_ 2, The output power cannot be higher than the maximum load for a long time._x000D_ 3, The input power must be higher than output power, because of the power consumption of the module itself._x000D_ FAQ:_x000D_ Q: Why the output voltage is lower than the nominal voltage?_x000D_ A :Because the input power is too low.Use a multimeter to test the input voltage, the input voltage is very low at this time.