Features: 1. Highly flexible silicone cause no pain to the skin.  2. It can be rotated by 180 degrees, and you can wear it on the left ear or right ear. The angle can be adjusted.  3. The Bluetooth 5.0 version is widely compatible with various mobile devices and compatible with multiple APPs.  4. This earphone is equipped with Bluetooth low energy chip and with 250 mAh high-capacity battery.  5. It features closed front cavity design, and made from high-density reinforced ABS material.  6. The high-definition microphone cooperates with CVC6.0 & DSP dual noise reduction technology to improve the clarity of the call and break the space distance constraint.  7. Two mobile phones or computers can be connected at the same time, which is convenient for work and entertainment.  8. It can be worn firmly, and it is not easy to fall during exercise.     Specifications: Color:Black/ Dark Blue/ White;  Wearing Type:Earhook;  Material:ABS;  With Microphone:Yes;  Volume Control:Yes;  Bluetooth Version:V5.0;  Supported Profiles:HSP/HFP/A2DP/AVRCP;  Transmission Distance:33 feet (10m);  Receive Sensitivity:106±3dB;  Frequency Response:20-20kHz;  Battery Capacity:250mAh;  Music Time (h):18-20h;  Call Time (h):20-25h;  Standby Time (h):280h;     Package Included: 1* Single Earphone;  1* Charging Cable;  1* User Manual