Item Type: Wireless Bluetooth Earphone Material: ABS Bluetooth Version: 5.1 Response Frequency: 20Hz-20kHz Sensitivity: 96db2db Effective Distance: Approx. 15m / 49.2ft Bluetooth File: A2DP/AVRCP/HSP/HFP Built-in Lithium Battery: 50mah for left and right earphones, 1200mah for charging compartment. Package List 1 x Manual 2 Pair x Ear Cap 1 x Charging Cable 1 x Charging Compartment 1 Pair x Earphone 15.1 bluetooth chip provides a faster and more stable connection with lower power consumption. 2Smart touch control design, just touch to switch to the previous/next song and adjust the volume. 3The battery capacity of the charging compartment is 1200mah, which can be used as earphone storage box and mobile phone holder to charge earphones/mobile phones. 4Using CVC8.0 intelligent noise reduction function to make calls, listen to songs and intelligently filter noise, enjoy Hifi sound quality and 9D stereo surround sound effects. 5Regardless of the mobile phone brand and model, devices that support bluetooth can use this headset. 6LED smart cold light digital display, realtime know the battery level of the headset and charging compartment.