Description: Bringing you stereo sound, this Bluetooth-compatible amplifier board with control buttons allows you to control the left and right channel volume, sound effects, subwoofer frequency, and volume as needed by using the rotary buttons. Not only support an Aux audio cable connection but also support Bluetooth-compatible version 5.0 connection, this amplifier board can receive audio signals from cell phones, laptops, tablets, and so on to the stereo amplifier output. It is constructed of PCB material. The length of this product is 11.8cm and width is 10cm. The length of this product is 2.2cm. The amplifier board is suitable for speakers, laptops, etc. Item Name: Amplifier Board Material: PCB Product Model: ZK-TB21 Bluetooth-compatible Version: 5.0 (Unobstructed 10 Meters) Input Sensitivity: 500mV Input Method: Aux And Bluetooth-compatible 5.0 Number of Sound Channels: 2.1 Channels Power Amplifier Chip: TPA3116D2 Applicable Power Supply: DC 12-24V/5A or Above Speaker: 20-100W, 4-8Ω Volume Adjustment: High-End Encoder Knob Adjustment, Smooth Hand Feeling Power Supply: DC12-24V Output Power: Left And Right Channels No More Than 50W, Subwoofer No More Than 100W Protection Function: Anti-Reverse Connection, Under-Voltage, Overheating, Over-Current, Short-Circuit Protection Features: 2.1 Stereo Channel, HiFi Sound, High Power Size Details: L: 11.8cm/4.65", W: 10cm/3.94", H: 2.2cm/0.87"(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Bluetooth-compatible Amplifier Board 1 x Screwdriver 1 x DC Adaptor 1 x Adaptor Board Bringing you stereo sound, this Bluetooth-compatible amplifier board with control buttons allows you to control the left and right channel volume, sound effects, subwoofer frequency, and volume as needed by using the rotary buttons. Not only support an Aux audio cable connection but also support Bluetooth-compatible version 5.0 connection, this amplifier board can receive audio signals from cell phones, laptops, tablets, and so on to the stereo amplifier output. It is constructed of PCB material. The length of this product is 11.8cm and width is 10cm. The length of this product is 2.2cm. The amplifier board is suitable for speakers, laptops, etc.