Active IP Box Speakers. Power supply by PoE at ieee 802.3at. Connect to server automatically. Automatically sync with the server. Supports the performing of timed tasks. External power: DC12V 3A. Frequency: 100hz- 18khz.SNR: 90 ± 3db. Built-in amplifier :15w.Power output:15w.Unit: 1×5 inch + 1× tweeter. Box Material: ABS. Rear panel: Aluminium alloy. LAN IN:RJ45.