BTTB Wireless Earbuds Bluetooth Headphones,Bluetooth 5.0 Auto Pairing in-Ear Headphones with Portable Case Wireless Charging Case826 Description 1.Drive:15mm 2.Impedance: 32 OHM 3.Bluetooth Version: Bluetooth V4.1+EDR 4.Bluetooth Frequency：2.4Hz 5.Power Grade：Class II 6.Output Power：30mW 7.Bluetooth Distance: 15 metersaccessible 8.FrequencyResponse:20-20000Hz 9.Operating Voltage Range:3.0V-4.2V 10.Microphone Sensibility：-42dB 11.A2DP/AVRCP High Quality Stereo Audio Transmission and Remote Control Protocol 12.Intense Noisy Cancellation Circuit 13.Switch Between Chinese and English(when the phone is not connected to the Bluetooth, press the switch twice to hear the tone switch successfully) 14.Charge for approximately for an hour( Power Indication:red light, full charge; blue light, the red light disappear) 15.Product Size: Length 25mm*Width15mm*Height35mm 16.Product Weight: 6 g 17.Call Duration: About 2-3 Hours 18.Music Duration: About 2-3 Hours 19.Standby Time：About 96 Hours 20.Charging Time: 60 Minutes 21.Battery Capacity: 55MAH 22.Power:DC 5V(Round Hole Interface), USB Port,Cellphone Charger, Car Charger. 23.The Weight of Whole Set: 60g 24.Package Dimension: 9.583.5*13cm 25.Including: Earphones+USB Cable+Manual+Package Box