Characteristics and Interoperability Wireless Music and Calling Compatible Ultrathin Metal True Wireless Earbuds with Zero Pressure 5.3 Quicker Signals With completely updated wireless 5.3, reduced loss of power more reliable wireless music playback. 13mm Moving Coil: Magnificent Tone Stunning bass, powerful moving coil units, and distinct vocals balanced frequency range for a richer audio experience. Extended Calls/Playback Extra long standby duration that allows you to call or playback continuously. Key/Sub Earbud Remover Make use of Elimination of main/sub earbud differentiation. Remove any one and use in pairs. Details Weight net: 61g Version 5.3 for wireless Distance of transmission: 210 meters Supported protocols: A2DP, AVRCP, HFP, and HSP 013mm Speaker Driver Unit 3.0 mW of rated power Rechargeable 120 hours is the standby time. 4H is the play time. 1.5 hours for charging Response frequency: 20–20 KHz 320 ips of impedance 180 mAh is the charging case battery capacity. Headphones