Specifications:The earphones adopts bluetooth-compatible 5.0 chip, which can provide fast and stable connection.There is an anti-dust design at the charging port.It is convenient to use them with the intelligent fingerprint touch.The magnetic switch of the charging box protects the charging box.With it, you can enjoy 9D stereo and HiFi music in your spare time.Item Name: Wireless EarphonesBluetooth Protocols: HFP 1.7/HSP 1.2/A2DP 1/AVRCP 1.6/SPP 1.2/PBAP 1.0Charging Voltage: DC 5VMicrophone Sensitivity: -42dBWorking Temperature:-10-50 Degree CelsiusFrequency Response: 20-20000HzSensitivity: 120dB +/- 5dBTransmission Distance: 10mCharging Time: about 1 HourTotal Battery Life: about 220 HoursEarphones Battery Capacity: 50mAh (Included)Charging Box Capacity: 2000mAh (Included)Features: bluetooth-compatible Connection, Large Battery Capacity, 9D Stereo SoundCharging Box Size: 7.8cm x 4.6cm x 3cm/3.15& 39;& 39; x 1.97& 39;& 39; x 1.18& 39;& 39; (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:2 x Wireless Earphones (Right & Left)4 x Eartips1 x Charging Box1 x Charging Wire1 x User Manual