This ultra-compact Wuzhi Audio ZK-502M Bluetooth Amplifier Board delivers powerful 50W+50W dual-channel stereo output for your custom DIY audio setups. It supports multiple media sources including Bluetooth 5.0, a micro USB sound card input, and a traditional 3.5mm AUX line-in. Built with an integrated volume dial and a dedicated physical on/off toggle switch, it easily powers passive speakers or pairs with headphones via its 3.5mm AUX output socket.