Audio ComponentsA: 40mm 4 Ohm 5W Mini SpeakerCategory: Electric (moving)Uses: Bluetooth speakersShape: roundComposition: combination of coneDiaphragm material: non-paperMagnetic circuit form: double magnetic typeFrequency characteristics: full band (full range)Rated power: 5 (W)Rated impedance: 4 (Ω)Frequency response: 150hz-20 (kHz)Sensitivity: 80 (dB / W)B: 5Wx2 Bluetooth 5.0 Decoder Amp Board1. DC3.7 Power supply (dual MOS battery) recommended 1-3A2. Support FM radio function, automatically search for radio stations and store3. Support AUX input function4. Support full function operation of infrared remote control5. Support LED digital screen real-time display of full function status6. Support USB / TF / radio / AUX automatic switching7.mp3 / WAV / WMA song decoding chip8. Support FAT16, FAT32 file system9. Support 32-320kbps mp3 songs10. Support power-off memory function: memory song and volume before power-off11. The product board with power amplifier 2 * 5W ,it can directly drive a pair of 4 ohm 3w or 2 ohm 5w speakersPanel key function description:1. PREV / VOL- set long press to decrease the volume; short press in USB / SD / radio mode for the previous song / previous radio station2. Short press “PLA / PAU” in USB / SD mode to play / pause; short press in radio mode to automatically search for and store3. NEXT / VOL + set long press volume plus; short press in USB / SD / radio mode for next song / next station4. MODE is the mode switching, the switching sequence is: USB → SD → radio → AUX: when there is U disk and SD card: the switching sequence is USB → SD → radio → AUX; when only U disk: the switching sequence is SD → Radio → AUX; when only SD: switch order is USB → Radio → AUX; when there is no U disk and SD card: switch order is radio