Model: ZK-TB22(Shell version) Name: 2.1 channel 50W+50W+100W tweeter subwoofer adjustment bluetooth audio power amplifier Power amplifier chip: TPA3116D2 Bluetooth version: 5.1 Bluetooth transmission distance: 10 meters (if you need a longer distance, please connect an external antenna yourself) Audio input: Bluetooth+AUX Audio output: left channel 50W + right channel 50W + subwoofer 100W Adapter power supply: DC12-24V, ≥7A (can not be connected to AC) Adapter speakers: left and right channels 20-50W, 4-8Ω; subwoofer 20-100W, 4-8Ω Volume adjustment: the master volume, stereo volume, and subwoofer volume can be adjusted separately, with a wide range of adjustment; master volume with buttons Single click: play/pause; double click: the next song; triple click: select or cancel box matching mode Protection mechanism: over temperature, over current, short circuit, anti-static protection Features: 1. Support Wuzhi Audio APP. Modify the bluetooth name, password setting, volume adjustment of prompt tone, on/off prompt tone, sleep aid, firmware upgrade, etc. 2. Box pairing function, the true wireless function enables two sets of speakers to be combined into left and right channel pairing boxes, with a stronger sense of spatial positioning. Product size: 121 x 100 x 26mm color:Black Material:PCB+Metal Package Contents: 1 x ZK-TB22 power amplifier board 1 x Screwdriver 1 x DC cable