R9S True Wireless Bluetooth Headset In-ear Earbud Sports Stereo

Specification:
Product name: Twst19
Bluetooth version: Bluetooth 5.1
Speaker size: 10mm
Bluetooth transmission distance: 10 meters
Frequency response range: 20hz-20khz
Speaker impedance: 320+15%
Microphone sensitivity: 42db+3db
Signal to noise ratio: 258db

Packing list
Bluetooth headset*1