[High-Fidelity Mono Amplifier] Experience superior sound with the 1001B Bluetooth amplifier board, featuring a 100W mono output for passive speakers (20–100W, 3–8Ω). Equipped with a TPA3116D2 chip for less than 0.3% distortion and advanced AAC Bluetooth decoding, this amp ensures crisp audio reproduction. [True Wireless Stereo Functionality] Use two 1001B units with stereo mode to create a stereo sound setup. This feature allows for seamless connection and synchronization of two Bluetooth amplifier boards, enhancing your audio experience with true stereo quality. [Versatile Control Knob] Manage your audio settings effortlessly with a multifunctional control knob. Adjust volume by rotating, play or pause with a single click, skip tracks with a double click, and toggle mode with three clicks. A long press powers the unit on or off, offering comprehensive control in one interface. [Multiple Input Options & Bluetooth 5.1] This compact amplifier supports inputs including AUX, USB flash drive, and USB sound card, alongside Bluetooth 5.1 connectivity for a stable, low-latency connection up to 15 m (49 ft). Easily connect a wide range of devices to enhance your listening experience. [Robust Protection Features] Designed for durability, the 1001B amplifier board measures 89 × 45 × 20 mm and includes multiple protection mechanisms such as over-voltage, under-voltage, over-heat, and short-circuit protection. Encased to safeguard against damage, ensuring consistent and reliable performance. Color: Black Material: Plastic + Metal Package Contents: 2 × Mini Bluetooth audio amplifier board