DROK Bluetooth Stereo 2.0 Channel Audio Receiver Bluetooth Audio Amplifier High-power 30W2 Suitable for 6.5-inch or below 6.5-inch Speakers,Bookshelf Stereo&DIY Audio Enthusiasts Modified Speakers&Support almost all smart phones, Tablet PC,Laptop Super compatibility, compatible to various tablet PC, TV, smartphone, Laptop with bluetooth, iphone, etc Stereo bluetooth two-channel amplifier with each channel output 30W, adapt TPA3110 amplifier chip Only suits for audio output receiver, music play, and sound receiver, not suit for calling Aluminum body volume knob, double potentiometer, gilded speaker stud child and bulk capacitance