Supports Android and systems. APP-enabled visual operation for volume control, sound effects, track navigation, play/pause, and playback mode selection. AUX o input delivers pure Hi-Fi sound quality: clear treble and midrange with gentle, detailed reproduction; powerful and impactful bass. 2.1-channel Bluetooth digital power amplifier board with independent left/right channel high/low frequency adjustment and independent subwoofer adjustment via 360-degree stepless tuning. Bluetooth 5.0 for improved transmission efficiency, extended range, and clear o performance. Constructed from high-quality materials for durability and long service life. Product Name: 2.1-Channel Bluetooth o Power Amplifier Module Product Model: YS-S100L Bluetooth Version: 5.0 Channels: 2.1 Input Methods: Bluetooth, AUX, USB flash drive, USB sound card Power Supply: DC 5–26 V / 10 A o Outputs: Left/Right channels, subwoofer output, 3.5 mm stereo output Volume Control: Premium encoder knob with smooth tactile response Frequency Range: 20 Hz – 30 kHz Signal-to-Noise Ratio: 92 dB Output Power: 50 W × 2 (left/right) + 100 W (subwoofer) Satellite Speaker Compatibility: 10–100 W / 4–8 Ω Subwoofer Compatibility: 20–200 W / 4–8 Ω Protection Features: Electrostatic protection, overcurrent protection, short-circuit protection, thermal protection Special Feature: Compatible with YS o app for remote control Color: Black Material: PCB Dimensions: 95 × 88 × 25 mm Package Includes: 1 × Top Cover 1 × Bottom Cover 1 × PCB Board 1 × Screwdriver 4 × M2 × 5 mm + 4 mm Copper Standoffs 4 × M2 × 18 mm Copper Pillars 5 × Button Caps 8 × M2 × 4 mm Screws Note: Color may vary slightly due to lighting and display settings. Dimensional tolerance: ±1–3 cm.