50W+50W DUAL CHANNEL -- F900 bluetooth receiver amplifier provides 50W+50W dual channel stereo output with the upgraded chip TPA3116. Impedance: 4~8 Ohm. | THREE INPUT OPTIONAL -- Supporting AUX/ USB/ Bluetooth input. But the amp module can be searched and connected via Bluetooth when unplugging audio input line. Insert audio input line, then it will auto switch to wired input mode, Bluetooth function will be lost. | SUPER COMPATIBILITY -- This Bluetooth audio transmitter can be widely applied to various tablet PC, TV, smartphone, Laptop with Bluetooth, iPhone and etc, versatile and simple to use. But it does not apply to a range of products launched by Amazon such as Echo, Alexa ect. and Bose Speakers. | MINI ELEGANT SIZE BUT POWERFUL -- Ultra small size (3*2.7*1.5 inch) with metallic colourful shell, advanced technology and chip, our Bluetooth stereo amplifier has good sound quality, no distortion, no humming or hissing and sounds clear, crisp. | QUALITY ASSURANCE -- We guarantee 30 days return and money back and lifetime customer service. Please feel free to contact us if you have any question before or after purchasing, our customer service is ready for you at anytime.