A4tech B27 2Drumtek True Wireless Earphone Bluetooth v5.2 Wireless Earphone

Speaker Size: 10 mm
Frequency Response: 20 Hz-20 kHz
Earphone Sensitivity: 102 dB @ -10 dBFS
Mic. Sensitivity: -42 dB @1 kHz/Pa
Earphone Impedance: 32 ohm
Bluetooth Version: v5.2
Operation Distance: 10 m
Earphone Battery Type: Lithium Battery (40 mAh)
Charging Case Battery Type: Lithium Battery (400 mAh)
Charging Power: 5V=500mA
Earphone Charging Time: ＜1.5H (Low Battery to Fully Charged)
Case Charging Time: ＜1.5H (Low Battery to Fully Charged)
Music Playtime with Single Charge: ≈5H (50% Volume Data)
Playtime from Charging Case: ≈20H (50% Volume Data)
Earphones weight: 4.5g
Weight: 41g