Speakers audio channels 2.0 channels number of speakers number of drive 2 driver diameter 4 cm audio rms power 6 w frequency range 70 - 20000 hz signal-to-noise ratio (snr) 80 db connections and interfaces transfer technology wireless bluetooth yes bluetooth version 4.2 bluetooth profiles a2dp,avrcp,hfp,hsp design product type mono portable speaker product color gray design cylinder volume control digital protection class (ip code) ipx7 protection function waterproof performance recommended use universal built-in microphone yes hands-free mode yes on/off switch yes power source battery/battery type built-in battery technology lithium polymer (lipo) battery capacity 3000 mah battery voltage 3,7 v battery/battery operating time 2 h battery charging time 3.5 h weight & dimensions width 75 mm depth 70 mm height 68 mm weight 515 g included in delivery warranty card yes included cables micro-usb operating manual yes quick start overview yes