Features: Stereo amplifier adopts excellent of 2x TPA3116D2 amplifier chip, 2x NE5532 operational amplifier chip, QCC3003 BT5.0 module, 2.1 channel output power 50Wx2and100W, can obtain clear audios sound. Speaker full frequency output, by using treble and bass knobs and adjustable 40-300Hz bass cut-off frequency, you will be able to get sound! Support for wireless playback of devices, BT5.0 wireless music technology and external antenna transmission distance of more than 15m or 49 feet. Full metal housing, ensure high quality and durability, advanced circuit design, built-in speaker protections circuit, ensure clear and clean sound. Upgraded power outlets are safe to use and include a high-quality 24V or 4.5A power supply that is sufficient to drive most passive speakers and active or passive subwoofers. Specifications: Material: Aluminum Alloy Output power: 50Wx2and100W THD: 0.04 percent SNR: 98dB Operating voltage: 12-24V Speaker frequency response: 20Hz-20kHz1dB Bass cut-off frequency adjustment: 40-300Hz Size: L118xW132xH35mm or 4.72x5.2x1.38in Output mode: Passive speaker and passive or active subwoofer Type: 1 or 2 or 3 or 4 Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Amplifier 1x Power Adapter 1x Antenna 1x Manual