Features: This is a DC-DC boost converter module with working frequency of 350 kHz. The input voltage is DC 1 V ~ 5 V, and output DC 5 V 2%. The module has high efficiency up to 95%, usually can be 76%~93%. Ultra small size and light weight, it is convenient to use. Widely used for AA, AAA battery-powered devices, breadboard, small power motor, cameras, electric toys, model aircraft, LED lighting, electronic DIY kits, etc. Specification: Input voltage: DC 1~5V Output Voltage: DC 5V2% Efficiency: 95% (usually is 76%-93%) Low quiescent current: 13uA Size(Not including pin): 10.6*10.5*5.6mm / 0.42*0.41*0.22in Weight: 2g / 0.1oz (approx.) Package list: 1 * Module Note: This is a DC - DC voltage converter module, please pay attention when using: 1, The input voltage should not be higher than maximum input range; 2, The output power cannot be higher than the maximum load for a long time. 3, The input power must be higher than output power, because of the power consumption of the module itself. FAQ: Q: Why the output voltage is lower than the nominal voltage? 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.