Feature 1 STABLE AND STURDY: Wood grain appearance with sturdy shell, 5.0 Bluetooth dual 50W channels, stable connection, durable and beautiful 2 MULTIPLE DECODING: Support U disk and small memory card playback, support multiple format decoding (MP3, WAV, APE, FLAC), MP3 sampling rate from 8~48K, bit rate from 8~448Kbps, bit width is 16bits, channel is mono stereo; WAV sampling rate from 8~48K, format is WAV ima, for Microsoft AD PCM, or WAV PCM, bit width for16bits; FLAC sampling rate from 8~48K, bit width is 16bits; APE support FAST or NORMAL encoding, bit width is 16bits 3 WIDE APPLICATION: The power amplifier can be connected to mobile phones, computers, tablets, notebooks, MP3, TVs and projectors with AV audio(lotus socket) or 3.5mm headphone output jack. Various mainstream Bluetooth devices on the market can be connected to realize wireless transmission 4 AUDIO INPUT: Support 3.5mm stereo sound input, RCA stereo sound input, small memory card, U disk, USB audio input(can be connected to computer, mobile phone, OTG, tablet OTG) 5 STABLE AND DURABLE: Power amplifier come with stable structure, excellent performance and long service lifeItem Type: Mini Bluetooth 5.0 Power AmplifierFeature Type: 2.0 StereoOutput Power: 50W and 50WPower Supply: DC9V-24VBluetooth Distance: Approx. 12meter / 39.4ft(barrier free)Bluetooth Protocol: 5.0Product Size(LxWxH): Approx. 110 x 90 x 50mm / 4.33 x 3.54 x 1.97inAudio Input: 3.5mm stereo sound input, RCA stereo sound input, small memory card, U disk, USB audio input(can be connected to computer, mobile phone, OTG, tablet OTG) Package List1 x Mini Bluetooth 5.0 Power Amplifier1 x User ManualNotePower And Power: The power amplifier adopts for TPA 3116 chip, the actual output power can reach 50W per channel, 2 channels total 100W (24V power supply), equipped with 12V5A power supply. The output power is 30Wx2 (4 ohms), if connected to 8 ohm speakers. The output is about 15Wx2. If you need more power, you can configure the power supply yourself. Be careful not to exceed 24V, otherwise the chip will be burned, and the power supply should not be too small, because power = voltage x current, if the current power is less than 50W, then There may be a power outage.Amplifier Output: The power amplifier is a constant resistance power amplifier, supporting passive audio or speaker of 4, 6, 8, 16 ohms. Cannot be connected to active audio such as computer audio, and not suitable for passive subwoofers. The four pillars behind the power amplifier are output interfaces, and cannot be connected to 3.5mm headphone plugs or lotus plugs.Car Modification: Conventional 12V batteries for cars and motorcycles can be directly modified for power supply. 24V batteries such as large trucks are not recommended, because the voltage will exceed 24V after the car is started. Unless you reduce the voltage through other equipment, the power amplifier will heat up too much. Long term use is not good for the chip, or even burns out.