Features: Input voltage DC 0.9 ~ 6V, output DC 3.3V(5%) The maximum input voltage must 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, compatible with development boards and breadboards. Applications: Battery powered devices, Breadboard Power Supply, compatible with ARM FPGA CPLD MCU development boards, power tools, small motors, cameras, video cameras, toy car power banks, LED lighting, wireless communication devices, 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. Important notes when using: 1. Input voltage must not exceed the maximum input range 2. Output power must not exceed the maximum load for an extended period 3. Input power must be greater than output power due to the module's own power consumption Q & A: Q: Why is the output voltage lower than the nominal voltage? A: The input power supply may be too low. Check the input voltage with a multimeter when the input voltage is very low.