Features: 100% brand new and high quality. This is a DC-DC boost converter module with working frequency of 350 kHz. The module has high efficiency up to 95%, usually can be 75%~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: Type: 3.3V, no pins; 3.3V, with pins; 5V, with pins (Optional) 3.3V: Input voltage: DC 0.8 ~ 3.3V Output voltage: DC 3.3V2% High efficiency : 95% (usually is 75%-93%) Low quiescent current : 13uA Low ripple and Low noise Size (Not including pin): 10.6*10.5*5.6mm / 0.42*0.41*0.22in Weight: 2g / 0.1oz (approx.) 5V: Input voltage: DC 1 ~ 5V Output voltage: DC 5V2% High 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.