Feature:Have bass diaphragm， strengthen the bass effectTF card ，support MP3 format musicWaterproof ，Dust-proof，Fashion for ourdoor and sportsLong press the button，the song can be fast forward/backward;Technical parameters:Input voltage:DC 5V 600MAOutput power:5W THD+N less than10%(1KHZ/0DB)Battery:3.7V 500MAHSpeaker size:D=45mm ，4OHM 5WFrequency response:120HZ-20kHZSNR:more than 90DBBluetooth edition:V3.0