Awei A770bl WIRELESS HEADPHONES

Bluetooth version: 5.0 chipset: jl6936d4 protocol: hfp/a2dp/avctp/avrcp working frequency of bluetooth: 2402mhz-2480mhz transmission distance: 10m battery audio. driver unit: 40mm sensitivity: 122d±3db impedance: 32ω±15% frequency response range: 20-20khz power. standby time: 25 hours talk time: 13 hours play time: 12 hours charging time: 1 h input voltage: dc/5v/300mah working temperature: -40°c/+85°c capacity: 250mah