Check the listing for details. High efficiency Low Quiescent Current 1.5V 1.8V 2V to 3V DC DC Boost Step up. Condition: New. Listed at 1.96 USD. Product Name: 300mA High Efficiency synchronous PFM step-up DC-DC converter 0.7-3V to 3V for AA AAA Dry cell powered equipment LED Packing list: 1 PCS High Efficiency synchronous PFM 0.7-3V to 3V Step-up Boost Converter Module Description: Input voltage DC 0.7 ~ 3V,output DC 3V±2% DC DC Boost Converter Module working frequency 350KHZ. High efficiency : 95%(usually is 77%-93%) Low Quiescent Current : 13uA Low ripple and Low noise Ultra-small size: 10.7x10.6x5.6mm Ultra-light weight : 0.65g Applications AA AAA Dry cell powered equipment Breadboard Power Supply Small power motors Camera, Video camera Electric toys Model aircraft LED Lighting CC1101 CC2500 ESP8266 WIFI Bluetooth Module Audio equipment Attention : This is a DC-DC voltage converter module,Must be noted when using: 1 Input voltage can not be greater than the maximum input range 2 Output power can not be greater than the maximum load for a long time 3 Input power must be greater than the output power, because the power consumption of the module itself Q & A: Q : Why output voltage is less than the nominal voltage A : Input power supply power is too low.Test the input voltage with a multimeter,a t this time of the input voltage is very low