Model: EW34,Bluetooth Version: 5.3,Chipset: JL AC6983D2,Supported Protocols: Headset, Hands-free, A2DP, AVRCP,Transmission Distance: Up to 10 meters,Transmission Frequency: 2.4GHz,Speaker Unit Size: 13mm,Impedance: 32 15%,Frequency Response: 20Hz 20kHz,Sensitivity: 98dB 3dB,Battery Capacity: Charging Case 250mAh, Headset 30mAh,Charging Case Input: DC5V, Type-C,Charging Time: Case 1.5 hours, Headset 1 hour,Talk/Music Time: Up to 4 hours,Standby Time: Up to 150 hours,Features: Leader-follower switching, voice assistant activation, song control, automatic power on/off, battery display support,Sizes: 57mm x 46mm x 23.5mm,Total Weight: 42g, Single Earbud Weight: 3g,