Product description Material: metal Size: 59.550mm Color: black, blue, red Frequency response range: 40Hz-20KHz Power supply mode: built-in lithium battery Function: voice prompt, call function Package content: 1 wireless bluetooth speaker 1.Small Palm Size Yet Shockingly Sound Bluetooth Speakers Impressive audio, full & high-def sound. Enjoy impressively full sound quality and robust bass realized through a 5W audio driver and a passive audio subwoofer. 2.Wireless Stereo Pairing & Fast Recharge Double your audio experience with two via fast paring. Besides, It has remarkable stamina for something so small. An ultra-high density battery enables 2 hours of non-stop playtime at 80% volume, up to twice times longer than similar-sized portable speakers. 3.Incredibly Compact & Metal Enclosure About the size of a ring box, this speaker fits into pretty much any pocket or bagyour jacket pocket or the small side pocket of your backpack so you can take your sound literally anywhere you want. 4.Broad Compatibility & Durable LanyardConnect iphone, ipad, laptops, Android phones, Apple phones, tablets, laptops, more with any NFC or Bluetooth-enabled device(version 2.1 and above) to start your tunes.