A4tech B27

Wireless Earphones A4tech B27, 10 mm driver, 32 Ohm, 100db, Bluettoth 5.2, 40/400mAh, IPX4, White. Bluetooth v5.2 Wireless Earphone Hybrid Diaphragm Φ10 mm Speaker Unit Wireless Transmission Independently Secure SportsFit Design Transparent Case Cover Water Resistant IPX4 Automatic Connects Voice Assistant Support Extended Playtime 22H + Speed Charge USB Type-C Rechargeable 3 Pairs of Ear Sleeves (S/M/L) & 2 Pairs of Ear WingTips (S/M) Included Frequency Response 20 Hz - 20 kHzEarphone Sensitivity 100 dBMic. Sensitivity -42 dBEarphone Impedance 32 ohmOperation Distance 10 mEarphone Battery Type Lithium Battery (40 mAh)Charging Case Battery Type Lithium Battery (400 mAh)Charging Power 5V=500mAEarphone Charging Time ＜1.5HCase Charging Time ＜1.5H Music Playtime with Single Charge ≈5HWeight 41 g