FOSI BT30D Pro Hi-Fi Bluetooth 5.0 receiver, 2.1 Channel Audio Amplifier Mini Class D Integrated Amp 165 Watt x 2 + 350 Watt for Home Outdoor Desktop Bookshelf Speakers/Subwoofers Description Brand: Fosi Audio Connectivity Technology: Wireless, Bluetooth Compatible Devices Speaker Surround Sound Channel Configuration: 2.1 Channel Item Dimensions LxWxH 15 x 12 x 2.5 cm Item Weight 750 grams Wattage 160 watts Number of Channels 2 About this item Advanced 2.1CH, Bluetooth 5.0 Receiver, Amplifier achieves HiFi music quality, the best choice for your home audio entertainment. You can connect passive speakers/passive subwoofer/powered speakers/powered subwoofer to your DIY a stereo sound system. Fosi Audio BT30D Pro is the upgraded version for BT30D. All-NEW Black Aluminum Appearance. BT30D VS BT30D Pro: MAX Power Output: 50 Watt x2 +100 Watt VS 165 Watt x 2+350 Watt, Amplifier Chip: TPA3116D2 VS TPA3255. Output: RCA output for powered subwoofers VS 3.5MM full-range output for powered subwoofers and speakers. Just choose one model for your needs. BT30D Pro Adopts 2 Texas Instruments TPA3255 high-performance Class-D power amplifier chips. BT30D Pro can drive up to 2 x 175 W into 4-? load and 2 x 220 W into 3-? load. In addition to excellent audio performance, TPA3255 achieves both high power efficiency and very low power stage idle losses below 1 W. This is achieved through the use of 60 m? MOSFETs and an optimized gate driver scheme that achieves significantly lower idle losses than typical discrete implementations. Professional wireless amp with subwoofer frequency, SUB volume, master volume/bass/treble control. No pop sounds, no audible noise during the connection. What's in the box 1 x BT30D Pro Amp 1 x power supply 1 x user manual