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Bluetooth V4.0 Audio Input: Supports Bluetooth V4.0 for wireless audio streaming. Also accepts DC 8V to 25V voltage input via 2.1mm jack. Dual Channel 50W+50W Output: Uses TDA7492 chip for dual channel power output. Provides 2x50W power for driving speakers. Higher overload capacity than analog amplifiers. NE5532 Preamp and TDA7492 Chip: Integrated NE5532 preamp and TDA7492 amplifier chip. Helps deliver clear sound quality for audio playback. Wide Speaker Compatibility: Suitable for 4 ohm, 6 ohm, and 8 ohm speaker impedance. Great for turning normal speakers into Bluetooth speakers. Compact Board Size: Board size 84×50mm. Easy to integrate into DIY audio projects. Package includes 1 amplifier board.