Maximum sound output: 109 ± 3dB
High-frequency average OSPL90：105±4dbB
Maximum sound gain: 26dB ± 3dB
Total harmonic distortion：≤3%
Frequency range: 200Hz-5500 Hz
Equivalent input noise level：≤15dB
Working current≤2mA 

1, USB charging, DC 2.0 cable
2, Support Bluetooth 5.0, with TWS mode.
3,DSP digital chips, intelligent noise reduction.
4, Working time: Hearing aids mode is 10-12 hours.
Bluetooth mode is 4-5 hours.
5, Charging time:2-3 hours
6, M key for switch BT and hearing aid mode
7, Don’t have left and right side ear limit to wearing.