Techmade TOUCHBUDS TM-K175 Manual Del Usuario página 24

Specifications
Touch control buttons
BT Version: 5.0
Input power: 5V
Charging box battery: 300mAh
Earphone battery: 30mAh x 2
Frequency: 20Hz-20kHz
Sensitivity: 115 ± 3DB
Impedance: 32Ω ± 15%
Operational distance: 10m
Speaker: 13mm