Techmade TOUCHBUDS TM-T31 Manual Del Usuario página 24

Specifications
Touch control buttons
Speaker: 10mm - 11mW, 32Ω
Sensitivity: -90dBm
Frequency response: 20Hz-20KHz
BT version: V5.1
Transmission power: + 4dBm
Operating distance: 10M
Earphone Battery: 30mAH x 2 Li-polymer
Charging case battery: 300mAH Li-polymer
Microphone: 40 ± 3db
Working frequency: 2.402GHz - 2.480GHz
Charging input: 5V 300mA