2.1 Channel Bluetooth Power Amplifier Board 220Wx2 350W Treble and Bass TPA3255 Chip Digital Amplifier Board Module with APP Control for DIY Speakers Item Type: Bluetooth Power Amplifier Board Material: PCB Sound Channels: 2.1 Channel Input Modes: Bluetooth, AUX, U Disk, USB Sound Card (Switch Modes and Songs with Dial Buttons) Adapted Power Supply: DC 16 to 38V ≥10A Adapted Speakers: Left and Right Channels 30 to 220W, 3 to 8Ω, Subwoofer 30 to 350W, 2 to 8Ω Bluetooth Version: 5.1 Voltage Gain: 30dB Protective Mechanisms: Anti Reverse Connection, Under Voltage, Overheat, Overcurrent, Short Circuit Prevention (Automatically Restored without Rebooting) APP: Supports for Wuzhi Audio Control