m15 tws wireless headphones bluetooth v5.1 earphone waterproof sports stereo wireless earphones touch bass headset mini earbuds

bluetooth version: 5.0 wearing method: semi-in-ear drive unit: 10mm moving coil impedance: 16ω ± 15% charging interface: micro-usb signal to noise ratio: 96db ± 3 frequency range: 2.4ghz-2.48ghz headphones: 30 mah (use time is about 2-3 hours) charging compartment: 300 mah (can charge the headset about 3 times) remarks: it takes about 40 minutes to charge the headset. it takes about 1 hour to charge the charging compartment.