modle : headphone sodo MH3 Bluetooth Wireless Speaker 

Bluetooth version: 5.0
Speaker: Φ9.6mm: 16Ω, 5mW x 2
Distortion: ≦ 1％
Frequency response: 20Hz-20kHz
Working time: 6-8 hours
Charging time: 2 hours
Standby time: 90 hours
Material: Aluminum + ABS
Working distance: up to 10 meters