Built-in power supply 52V/3.85A, no burn-in, high-speed and stable.The power supply is stable, saving money and worry.DC fan cooling, high speed, low noise and . Intelligent power supply 250 long-distance transmission. The connection is stable and not stuck, preventing crosstalk problems in data transmission, reducing external interference, and greatly improving network stability. Product name: switchTransmission distance: 250 Port description: 2 1000M ports + 16 10M/100M copper RJ45 portsSupported protocols: IEEE802.3 IEEE802.3i IEEE 802. 3u IEEE802. IEEE802. 3x IEEE802.1g, PoE port: 190W built-in power supplyWorking environment Temperature: -20~80, Humidity: 0~95% (no condensation)Plug Type: US Plug, it applies to Canada, , Mexico, Thailand, Taiwan, the , the Philippines and so on. material: metalColour: BlackProduct size: 270 x 179 x 43mmPackage Contents:1 x Switch1 AdapterOnly the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.