1. TDA7297 classic amplifier chip, dual channel 15W x 2 output, high fidelity sound quality. 2. Pure audio Bluetooth reception, no call interference, privacy protection, 10 meter long-distance transmission. 3. Good effect, signal-to-noise ratio of 91dB, low background noise, pure and clear sound quality. 4. Compact size and appearance, suitable for mini audio modification and assembly. 5. Plug and play design, simply connect the power and speaker to produce sound, easy and convenient to operate. TDA7297 is a classic 2.0 power amplifier chip, known for its excellent performance and high fidelity high-power output. In response to market demand, we have incorporated a mini Bluetooth module using this chip to form a smaller Bluetooth amplifier. When you connect the power and speaker to your hand, it immediately emits sound, giving you a Bluetooth speaker and freeing you from wired constraints. The Bluetooth module is specifically designed for pure audio reception during programming, without functions such as calling or receiving. Incoming calls can be answered directly with a mobile phone, avoiding interference with others and effectively protecting your call privacy. After the call ends, music continue to play automatically. Product Name: TDA7297 Long distance Audio Receiver Bluetooth Amplifier Board Working voltage: single power supply 7-12V, recommended 12V/2A switching power supply Working current: above 2A Receiving distance: 10 meters Maximum power: 15W+15W, recommended to use speakers with 15-50W 4-8 Frequency response range: 20Hz-20KHz Signal input: 300-650mV Signal to noise ratio: 91dB Color: As Shown Material: PCB Package Contents: 1 x Audio receiver module 1 x extension cable 1 x potentiometer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.