Volkano Rush 2.0 Series Bluetooth Earphones - Silver Cable Length Adjuster: Any extra earphone cable wire can be clamped using this nifty accessory, allowing you an optimal fit Earbud Caps: Small, medium and large caps are included; you can choose whichever gives you the best fit In-Line Remote: You can easily adjust the volume, skip tracks, play, pause and answer calls using the in-line remote Bluetooth Operating Distance: 10 m Chipset: BK Bluetooth Version: 4.2 Bluetooth Profiles: HFP, HSP, A2DP, AVRCP Playback Time: 3 – 5 hrs Battery Capacity: 55 mAh Charge Time: 2 hrs Battery Type: Impedance: 32 O Sensitivity: 98 dB Driver: 10 mm Power Requirement: 5V DC , 1A Frequency Response: 20 Hz – 20 kHz What's in the box 1 x Volkano Rush 2.0 Series Earphones Silver