Features: Input voltage DC 0.9 ~ 6V, output DC 3.3V(5%) The maximum input voltage can not exceed 6.5V Auto Buck-Boost Converter Module working frequency 1MHZ.efficiency 61%-85% . Operating temperature range : -25~+85 Degrees Celsius Storage temperature range : -45~+125 Degrees Celsius 2.54mm pin pitch,MCU Development Board Breadboard friendly. Applications :Battery powered equipment,Breadboard Power Supply,ARM FPGA CPLD MCU Development board,electrical tools,Small power motors,Camera, Video camera,Toy car power bank ,LED Lighting,Wireless communication equipment,Audio equipment Specification: Input voltage DC 0.9 ~ 6V Output: DC 3.3V(5%) Operating temperature range : -25~+85 Storage temperature range : -45~+125 Weight: Approx.3g/0.1oz Package list: 1 x Step UP&Down Converter 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