Reviews from scarbir(scarbir.com)
Microphone Unit: Φ4.0 x 1.5mm
Directivity: Omni-directional
S.P.L: -42dB±3dB
Operation Voltage: 2V
Frequency Response: 20Hz-20KHz
Impedance: <2.2 kΩ
Speaker
Speaker Diameter: Φ8mm
Impedance: 16Ω
S.P.L: 90±3dB (1K,1mW)
Rated Power: 10mW
Frequency Response: 20-20KHz
Bluetooth
Bluetooth Version: V5.0
Bluetooth Distance: 33ft/10m
Transmission Range(Hz): 2402-2480MHz
Support Profile: HFP, HSP, A2DP, AVRCP
Pairing Name: AUSDOM TW01
Battery
Battery Type (Li-Battery Capacity): Earphone, 50mAh; Charging Case, 600mAh
Charging Port: Micro USB/5V-1A
Running Time: Talking Time, about 8h; Music Playing Time, about 6h
Standby Time(power off state): 2000h
Charging Time: Earphone, 1h; Charging Case, about 1.5h
Operating Temperature: -10℃-45℃
Takes $20 off with code SVE20 (expires 26/09/2022), so for $5.