Product Specifications Small & solid but powerful mini BT amp Built-in Bluetooth for wireless audio streaming Compatiable Inputs with Bluetooth connection, RCA & MIC Input, USB Port, SD/TF Card & FM Radio Model: 298A Color: Black Material: Aluminum Alloy Voltage: 110V AC or 12V DC 5A Impedance: 4-16 RMS Power: 40W x 2 Peak Power: 300W x 2 Resolution: 47K SNR: 80db Distortion Rate: 0.4% Frequency: 20-20KHz FM Radio Frequency: 87.5-108MHZ Channel: 2 Channel Unit Weight: 2.4pounds / 1.1kg Unit Size: 7x5.4x2 / 18x13.8x5.5cm - RMS 40Wx2 Stereo Effect-- This little BT amplifier packs a lot of punch for its size! It sounds clear and clean, gets pretty loud without loss in sound quality. Small size makes it easy to handle. Low profile design fits easily into your bookshelf or A/V cabinets. A great volume for a small apartment, such as bedroom, small office, basement and garage. - Affordable Budget yet Great Sound -- Great value with the price for beginners that dont want to break the bank and dont need anything too fancy. (NOTE: This little BT Amp receiver does make a hit for your needs if its a room type situation or where a large expensive system would not be desirable. But if youre a pro audiophile, please be sure to choose the much more massive expensive one.) - Bluetooth/RCA/USB/SD Card/2 MIC/FM Input-- You can connect it with your music streaming devices like pc/mobile/laptop either with Bluetooth connection, RCA & MIC Input. It also supports USB Port, SD/TF Card port & FM Radio. (NOTE 1: Please keep the distance within 16.4ft/5m between the device and amplifier without any wall blocking. But if you are connecting with PC devices, please keep the distance within 6.5ft/2m.) (NOTE 2: The frequency range of the radio reception is 87.5-108MHz.) - Easy Operation-- Its remote control feature allows you to change audio settings from distance making you less tired and more comfortable. With bass and treble control knobs you can set the desired output of music according to your wish. Bright digital LED display lets you see the settings you change easily. - Warm Tips-- The 2 microphone inputs are nice & handy for karaoke or announcements. But if it got some hissing sound from the mic ports somehow even when youre not playing any music, please dont worry. Its just the magnetic interference with your own microphones, which is mainly caused by the Condenser Microphones, hence we suggest using Dynamic Microphones instead. Or put a magnetic block in there then the hissing sound will be gone.