It does not have auto detection function and directly supplies power to the network devices by force as soon as they are connected. Powered devices or POE splitters must conform to standard IEEE 802.3af/at. At the same time, your powered device must support POE pin 4/5 7/8 (-) midspan. Power Input = Power Output × channels. Take 4-port POE injector as example: DC48V 4A Input = DC12V 1A Output per channel, DC48V 2A Input = DC48V 0.5A output per channel. If you only use 3 of 4 channels, DC12V 3A input = DC12V 1A output per channel. Please select according to your device power consumption. In order to ensure stable operation, the total power consumption must be lower than the total power supply. This POE adapter applies to IEEE802.3af/at standard POE powered devices such as DAHUA, HIKVISION, and other brands' IP cameras, or can be used together with IEEE802.3af/802.3at standard POE splitters for non-POE devices. LED: Indicates the working state. LAN port: 8 ports in RJ45 (data in), 8-port POE RJ45 (data & power out). Data in: PC/Hub/Switch/Router, etc. Working temperature: 0~+40°C. Working humidity: 20~90% RH non-condensing. Storage temperature & humidity: -20~+85°C, 10~95% RH. Weight: 120g. Color: Black. Material: ABS + electronic components. Product size: 10×4.7×3.1cm. Package Contents: 1 × 4-port POE hub 1 × carton Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3cm.