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ZK-502M AMP is a mini Bluetooth AMP smaller than a card, its peak output power can reach 50W+50W, wide voltage input 5-24V, you can easily buy a suitable DC power supply. This AMP protection board is printed with connection icons so you can easily connect to any port without reading the manual. This AMP has three input methods, its input sequence is USB mode/AUX mode/Bluetooth mode. You can connect to the computer directly via the USB interface without a driver, you can also connect to the playback device via the AUX 3.5 mm interface, you can also connect to the mobile phone via Bluetooth mode. There is no doubt that both can be connected. When you connect passive speakers, this amplifier is a Bluetooth power supply.; Product description Features: Audio input: Bluetooth + AUX + USB flash disk + computer USB (plug and play). Power supply: DC 5-24V (high power recommended high voltage) Speaker adaptor: 10-100W; 4-8Ω Channels: left and right stereo (stereo). Bluetooth version: 5.0 (>15 meters without occlusion) Protection mechanism: overheating,over-current,short circuit protection. Product size: 60 x 60 x 29 mm. Package includes: 1 x Bluetooth Digital Amplifier Module Kit; Product description Features: Audio input: Bluetooth + AUX + USB flash disk + computer USB (plug and play). Power supply: DC 5-24V (high power recommended high voltage) Speaker adaptor: 10-100W; 4-8Ω Channels: left and right stereo (stereo). Bluetooth version: 5.0 (>15 meters without occlusion) Protection mechanism: overheating,over-current,short circuit protection. Product size: 60 x 60 x 29 mm. Package includes: 1 x Bluetooth Digital Amplifier Module Kit; Features: Audio input: Bluetooth + AUX + USB flash disk + computer USB (plug and play). Power supply: DC 5-24V (high power recommended high voltage) Speaker adaptor: 10-100W; 4-8Ω Channels: left and right stereo (stereo). Bluetooth version: 5.0 (>15 meters without occlusion) Protection mechanism: overheating,over-current,short circuit protection. Product size: 60 x 60 x 29 mm. Package includes: 1 x Bluetooth Digital Amplifier Module Kit