The wireless earphone has bluetooth-compatible 5.1 technology, which has high performance. With 50mAh capacity battery, it can work for 4 hours and has a standby time of 200mAh. Automatic pairing and smart touch are supported, which is convenient to use. It adopts CVC8.0 noise reduction technology and you can have a clear phone call. Item Name: Wireless Earphone Material: ABS Bluetooth Version: 5.1 Transmission Space: 10m Frequency Response Range: 20-20000Hz Sensitivity: 120dB 5dB Charging Time: about 1 Hour Cumulative Standby Time: about 200 Hours Work Time: 4 Hours Earphone Battery Capacity: 50mAh (Included) Charging Box Battery Capacity: 2000mAh (Included) Charging Box Charging Times for Earphone: about 24 Times Features: Stereo, Rechargeable, Smart Touch Charging Box Size: 8cm x 4.6cm x 3cm or 3.15" x 1.81" x 1.18" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 Pair of Wireless Earphone 1 x Charging Cable 1 x Charging Box