1. Wide Voltage Power Supply: DC 7.4-12V (≥2A current); universally compatible with trolley speakers and portable audio systems. 2. 2x25W Bluetooth Amplifier: Peak output power 50W; provides rich, powerful, and stable sound quality. 3. Stable Bluetooth 5.3 Connection: Long press the pause button to answer calls, achieving seamless switching between music playback and hands-free calling. 4. Universal Audio Source Compatibility: Supports MP3 decoding and multiple input modes, including USB, TF card, and FM radio. 5. Power-Off Memory and Remote Control Function: Features automatic power-off recovery, eliminating the need for repeated manual settings and ensuring convenient operation. Product Specifications: Power Supply Voltage: DC 7.4-12V Current Requirement: ≥2A FM Radio Frequency Range: 87.5-107.5 MHz Peak Power Output: 50W Color: Black Material: Metal+Plastic Package Contents: 1 x Amplifier Board, 1 x Remote Control, 1 Set of Cables 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.