Welcome to our store! The left and right earphones are equipped with music control and phone connection keys. The earphones support hands-free calling, and the built-in microphone ensures clear calls. The charging box allows you to carry the earphones with you. Product Name: Wireless EarphonesBluetooth Version: 4.2Power Input: DC 5VEarphone Battery Capacity: Built-in 3.7V 50mAh (included)Charging Case Charging Time: About 2 hoursTalk Time: About 5 hoursTransmission Distance: 10 metersTalk/Play Time: About 5 hoursEarphone Charging Time: 60 minutesCharging Case Battery Capacity: Built-in 3.7V 350mAh (included)Supported Protocols: HSP/HFP/A2DP/AVRCPSensitivity: 120 >Frequency Response Range: 20 - 20000Hz Impedance: 16 Features: Wireless, Stereo, Comfortable to WearCharging Case Size: 7cm x 5cm x 4cm/2.76" x 1.97" x 1.57" (approx.) Note: Due to the light and screen setting difference, the product color may be slightly different from the picture. Please allow slight size difference due to manual measurement. Package Included:1 pair of wireless earphones1 x charging case1 x charging cable1 For earmuffs Note: Please allow slight errors due to manual measurement and different monitors. (Customer satisfaction) - is our top priority. If you find any product problems after receiving the goods, such as damage or incorrect quantity, please contact us immediately. We will make every effort to provide you with satisfactory after-sales service. Thank you for meeting with me. I hope it will be helpful to you. I wish you a happy life.