Features: 1. As a digital power amplifier and music player, it supports RCA/AUX/USB/BT 5.0/TF card input and is compatible with almost all home audio devices, such as mobile phones, tablets, computers, TVs, set-top boxes, CD players, etc. -Disk and TF card support WAV, APE, FLAC lossless format 2. The USB interface supports U disk, computer (no driver required) and mobile phone (with OTG function) input. Bluetooth 5.0 achieves stable and faster transmission speed, and TF card allows you to easily enjoy high-quality music even on the road or outdoors. 3. Using the classic TPA3116 chip, the maximum output power can reach 50W*2, which is sufficient for most home desktop/bookshelf/indoor passive speakers (4-16Ω). Even at high output, the sound is clear and clean, without any audible noise. 4. Compact design and exquisite appearance, exquisite chassis with LED display and power/mode switching, very suitable for home and desktop audio systems. DC 9-24V wide voltage makes it can be used in cars or motorcycles. Specifications： Type: Bluetooth power amplifier Color: black/silver Quantity: 1 Material: Plastic + Metal Output power: 50W+50W Power requirements: DC9V-24V Bluetooth distance: at least 12m (barrier-free) Bluetooth protocol: Bluetooth 5.0 Speaker impedance: 4Ω -16Ω Audio input: 3.5mm stereo input, USB audio input, Bluetooth 5.0, RAC input, TF card, USB input (can be connected to computer, mobile phone, OTG) Support format: MP3/WAV/APE/FLAC Package includes: 1*Bluetooth digital mini amplifier Manufacturer Information: Company: BLACKSTONE ELECTRONICS CO LIMITED Address: UNIT D12 ON 16TH FLOOR JING HO INDUSTRIAL BLDG NOS.78-84 WANG LUNG ST TSUEN WAN NT Email: black_stoner@outlook.com Tel: +8618123753837