1It can charge the mobile phone and act as a portable power bank. 2For DSP dual noise reduction technology, so that the call is high definition. 3Fine vocal units make medium and high frequencies delicate, soft and low frequencies pleasing to the ear. 4Automatic second connection, use with headphones on. Summon for AI sound assistant. 5Magnetic absorption, earphone not easy to fall off. Easy to use. Item Type: Bluetooth Earphone Material: ABS Color: As Pictures ShownWeight: Approx. 253g/8.9oz Bluetooth Version:BT5.0+EDR Support Protocol:HSP/HFP/A2DP/AVRCP Special Transmission Distance: 10m/32.8ft Running Time: About 4.5 Hours Charging Time: About 1-1.5 Hours with Full Earphone Battery. The Charging Case is Full for About 2 Hours Battery Capacity: Headset :40mAh Charging Case: 2600mAh 1 x Charging Box 2 x Earphone 4 x Ear Cap 1 x Manual 1 x Charging Cable