Unique design, sound quality is excellent Output power: RMS 3W = 10%SNR: ≥ 70 dBSpeaker: diameter 45mm, 4 ohmLINE IN connector: with a standard 3.5mm audio cable (standard)Decoding TF cardFM (optional)Power Input: 5V/400mA power adapter (optional), USB power supply and built-in lithium battery (standard USB power cable)TF card in the decoder at any time using the playback pause, adjust volume, ...