About this item Electrical ParametersUSB step up boost converter input voltage: DC 5V; output voltage: DC 9V; max output current: 1.2A; convert ratio: 80%-90%. Note: not suitable for high current equipment. Appearance ParametersAppearance: frosted shell; weight: 39g; size: 1.97 x 0.71 x 0.35 inches. It is very suitable for travel, outdoor use, power down use. Security ParameterBuilt-in intelligent IC circuit and high-quality electronic components provide your devices perfect protection from over-current, over-voltage, over-temperature, and short circuit. Widely Usage Plug and play, it is widely used in 9V low-power equipment such as a wireless router, smart speaker, smart camera, light band, game console, table lamp, breast pump, mini fan, development board, etc. Size: 1.97 x 0.71 x 0.35 inches.