A4tech B20

Wireless Earphones A4tech B20, 13 mm driver, 32 Ohm, 102db, Bluettoth 5.2, 40/380 mAh,IPX4, White. Bluetooth v5.2 Wireless Earphone Hybrid Diaphragm Φ13 mm Speaker Unit Wireless Transmission Independently Half-in-Ear ErgoFit Style Transparent Case Cover Water Resistant IPX4 Automatic Connects Voice Assistant Support Extended Playtime 20H + Speed Charge USB Type-C Rechargeable Frequency Response 20 Hz - 20 kHzEarphone Sensitivity 102 dB @ -10 dBMic. Sensitivity -42 dB @1 kHzEarphone Impedance 32 ohmOperation Distance 10 mEarphone Battery Type Lithium Battery (40 mAh)Charging Case Battery Type Lithium Battery (380 mAh)Charging Power 5V=500mAEarphone Charging Time ＜1.5HCase Charging Time ＜1.5H Music Playtime with Single Charge ≈5HWeight 39 g