Feature 1APP Control: Stereo amplifier board can cell phone APP, Bluetooth, AUX, U disk, USB sound card active speaker output and passive speaker output. Bluetooth version is 5.1. 2Stereo: Digital power amplifier board is connected by AUX sound, easily achieve stereo playback, sound 360 degrees of non infinite tuning. Adapted speakers are 20W200W 4 8. 3U Disk Mode: Power amplifier module plugged into a U disk, open the APP to switch to "U disk" mode, with a prompt to enter the U disk playback mode, restore stereo sound. 4Dual Channel: Sound power amplifier board left and right channel output interface, 3.5 output interface can be directly and effectively connected to passive and active sound or wired headphones at the same time. 5Support System: Stereo amplifier board supports for Android and for IOS systems, APP visual operation playback mode volume, sound, up and down song control, play pause, play mode to modify the Bluetooth name, set the connection password.Item Type: Stereo Bluetooth Digital Power Amplifier ModuleMaterial: PCBBluetooth Version: 5.1Transmission Distance: 15m / 16.4yd (No Obstruction)Power Supply: DC12-24VNumber Of Sound Channels: Left and Right Dual Channel (Stereo)Adapted Speaker: 20W-200W 4 8Protection Mechanism: Power Reverse Protection, Short Circuit Protection, Self-Recovery Overheating ProtectionAPP Support for YS Sound APP Control .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Power Amplifier Board1 x Upper Cover Plate1 x Lower Cover Plate1 x Knob Cap1 x DC Adapter1 x Heat Sink1 x Screwdriver4 x M2 x 3mm Screws4 x M2 x 18 Copper Post4 x M2 x 6 mm Screws