Specification: Weight: Approx. 6.4 g x 2 Weight for Charging Case: Approx. 42 g Dimension for Charging Case: Approx. 50.4 x 50.4 x 32.6 mm Headphone Type: Open Air Driver Unit: 10.0 mm Frequency Response (Bluetooth Communication): 20 Hz - 20,000 Hz (44.1 kHz sampling) Volume Control: Yes WaterProof: Yes (IPX4) Multipoint Connection: Yes Dsee: Yes Battery Charge Time: Approx. 1.5 hrs Battery Charge Method: USB charge (with case) Battery Life (Continuous Music Playback Time): Max. 9 hrs Battery Life(Continuous Music Communication Time): Max. 4 hrs Battery Life(Waiting Time): Max. 15 hrs Bluetooth Core Version: Bluetooth Specification Version 5.3 Effective Range: 10m Frequency Range: 2.4 GHz band (2.400 0 GHz - 2.483 5 GHz) Profile: A2DP, AVRCP, HFP, HSP Supported Audio Format(S): SBC, AAC Supported Content Protection: SCMS-T What's in the box: Sony WF-LC900 Linkbuds Clip Air Fitting Cushions for LinkBuds Clip Charging Case Reference Guide Warranty Card Part of you. Open to life. Wear it all day, stay in the sound. Open-ear comfort, three tap-to-switch listening modes, and balanced tuning for rich sound, with AI voice pickup to keep your calls clear. Carry your sound with open-ear listening. Stay in touch with your environment and in tune with your tracks. 12 Months Local Manufacturer Warranty Store in a cool dry place. China