Feature: 1. The power amplifier supports U-disk input, AUX input and sound card input. 3 inputs are optional. 2. Mobile app control support for Android/iOS system, playback mode for visual app operations. 3. Super compatibility, can be widely used in various tablet computers, TVs, smartphones, laptops with Bluetooth function, etc. 4. With reverse connection, short circuit protection and overheating protection against self-recovery 5. Small, easy to carry and store, convenient to use and with good performance. Specification: Item Type: Bluetooth Power Amplifier Material: aluminium. Colour: blue. Supply voltage: DC8-24V (the higher the voltage, the larger the output). Output power: 20W Channel: 2 channels. Bluetooth version: 5.0 Cool function: supports Sinilink app control. Input mode: Bluetooth + AUX + U disk + USB sound card. Volume control: volume control of the encoder, smooth feel, one button switch Transmission distance: approx. 15 metres (49.2 feet) (unhindered). Number of channels: left and right double channel (stereo) Adapted speakers: 10W-200W 4Ω 8Ω 16Ω Protection mechanism: protection against reverse connection, short Package contents: 1 x Bluetooth power amplifier.