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Case: 10 ( l ) x 2.8 ( w ) x 2.8 ( h ) ; ABS & silicone ; earbuds: 60 ( l ) x 2.2 ( w ) x 1 ( h ) ; ABS & TPE ; supports playback and call pick-up from smartphones, tablets or most other ; Bluetooth compatible audio devices ; internal rechargeable lithium polymer battery ; recharges via USB cable ( includes ) ; Bluetooth version 3.0 ; 10m visible distance ; 2 hrs recharge time ; 1 hrs playback time ; For music lovers, our Crescendo Bluetooth Earbuds offer a quality sound experience. With a built-in mic that allows you to pick up calls, it also supports playback from smartphones, tablets and other Bluetooth compatible audio devices, and is easily rechargeable. Branding Options: Direct to Print (DP); Pad Printing (PB); Pad Printing (PC)