Characteristics and Interoperability Model: Q15 Version: 5.0 Regularity Reaction: 20 Hz–20 kHz Transmission range: <10 meters Supported protocols: AVRCP, HFP, and A2DP 45 mAh two-cell batteries (earphone) 450m4h (case of charging) Call time: approximately seven hours at 50% volume Weight of earbuds: 4.76g x 2; weight of charging bin: 38.7g