Reminder: This earphone is RIGHT-EAR style only, and it won't work for left ear. Please kindly see that before you place an order. Thank you for your understanding ! - Bluetooth V4.1 earphone: Steady signal and lower power consumption. Effect wireless transmission distance up to 33ft/ 10m. CVC 6.0 noise canceling technology, allows you to talk clearly in noisy environment with built-in MIC. - Light Weight: Less than 10g/ 0.35oz, light weight and compact, no burden to your ear, easy to store in your pocket and bag. - RIGHT-EAR Wearing Design: RIGHT-EAR wearing style with adjustable 18°ear-hook, ergonomically close to the auricle of your right ear, provide all-day-long comfortable wearing experience. - Tiny Body & Multi-functions: Support Voice Control by saying Yes/No to answer or reject the call to enable your safe driving and comfortable sports; Support in-coming call phone number reporting; Support one button(MFB) to Answer/Reject call or Pause/Replay song. Support to press Cycle Button to control Volume/Song. - Long Battery Life and Great Compatibility: Build-in 55mAh rechargeable Lithium-ion battery, you could feel free to talk around 4 hours or enjoy music for nearly 5 hours after fully charged. Specifications: - Model Number: X16 - Bluetooth Version: Bluetooth 4.1 (Bluetooth Chip: CRS8615); Class 2. - Supports HSP, HFP, A2DP, AVRCP, Apt-X protocol. - Operation Range: up to 10 meters - Frequency Response: 20-2000kHZ - Impedance: 32 - Sensitivity: 101.5db± 3db - High-quality 3.7V/ 55mAh Rechargeable Li-ion battery - Music Playing Time: about 5 hours (the volume will affect the time) - Talk Time: about 4.5 hours - Standby Time: 120 hours - Charge Time: 1.5hours - Charge Port: Micro USB - Color: Blue & Black, Golden & White, Grey & Black, Red & Black (as shown in the picture) - Earphone Weight: 8g/ 0.28oz - Earphone Dimensions: 5.0 x 4.0 x 3.0cm/ 1.96 x 1.57x1.18in Package Contents: 1 x X16 Bluetooth 4.1 Earphone 1 x Charging Cable 1 x Pair of Earbuds 1 x English User Manual