Item Specifics:Type: Two-channel bluetooth 5.0 power amplifier boardInput voltage: DC5-27VAmp Chip:TPA3116Output impedance:4~8SpeakerOutput power: 100W*2Current: 3AFilter: LC filterbluetooth version: BT 5.0Audio input: bluetooth, AUXNumber of channels: 2 channelsSize: 107*52*24mm / 4.2*2*0.9inchbluetooth transmission distance: 15 metersSupport Format: FLAC/APE/MP3/WMA/WAVProtection mechanism: Overvoltage, Undervoltage, Excessive, DC detection, Short circuit protectionFeatures:--CHIP: TPA3116with AM interference suppression function, 100w+100w output power, wide voltage input: 5V-27V, can Be powered by 9V/12V/15V/18V/24V. Adapter speaker 4-8 (50w-300w)--Two Audio Iput Ways: User Can Directly Connect with Wireless bluetooth 5.0, or Choose the Headphone (Line in) Way--Easy Installation and Short Start-up Sound: The illustration of each interface is printed on the protective plate, making it easy to install even without instructions. The sound of the amp board to start and connect to Bluetooth is short rather than not a womans voice.--Protective Function: This BT Amp Is Designed with Protective Case, Reverse Connection protection, Over-voltage Protection, Under-voltage Protection, Over-heat Protection, Short-circuit Protection-- Please use a power adapter with sufficient power to connect the amp board, otherwise the sound will be distorted. And make sure the AMP board is away from the wifi signal.Tips and tricks:To have enough output power if the audio input is sufficient and t