Features 1、HiFi Sound Quality: The Bluetooth power amplifier board is easy to connect, with excellent sound quality and long service life. 2、Support: Support U disk and Memory Card playback, support multiple format decoding (MP3 MAVAPE FLAC), MP3: sampling rate: 8~448Kbps, bit width: 16bits channel, mono stereo; WAV: sampling rate: 8~48K , Format: MAVima, for Microsoft AD PCM, WAV PCM, bit width: 16bits; FLAC: sampling rate: 8~48K, bit width: 16bits; APE: FAST, NORMAL encoding, bit width: 16bits. 3、Power And Power Supply: The power amplifier adopts MA12070 chip, the actual output power can attain 68W per channel, 2 channels total 136W (20V) power supply, equipped with 12V5A power supply. The output power is 30Wx2 (4 ohms). 4、Power Amplifier Output: The power amplifier is a constant resistance power amplifier, supporting passive audio speakers of 4 ohms, 6 ohms, 8 ohms and 16 ohms. It cannot be connected to active audio such as computer audio, and is not suitable for passive subwoofers. The 4 pillars behind the power amplifier are output interfaces. It cannot be connected to 3.5mm headphone plugs or lotus plugs. 5、Accessible Devices: The power amplifier can be connected to mobile phones, computers, tablets, laptops, MP3, TVs and projectors with AV audio (lotus socket) or 3.5mm headphone output jack, etc. The mainstream Bluetooth devices on the market can be connected to realize wireless transmission . Specification Item Type: Bluetooth Amplifier Material: Aluminum Feature Type: 2.0 Stereo Output Power: 50W x 2(24V 4Ω Load) Working Voltage: DC 9V-24V Bluetooth Distance: At Least 12m (Barrier Free) Bluetooth Protocol: 5.0 Memory Card: Maximum Support 128GB (Not Included) Audio Input: 3.5mm Stereo Input, RCA Stereo Sound Input, Memory Card, U Disk Usb Audio Input (Can Be Connected To Computer, Mobile Phone, OTG, Tablet OTG) Package List 1 x Host 1 x User Manual