Color: white/black
1. bluetooth version: 5.4 【 two ear call 】
2. support protocols: a2dp/avrcp/hfp/hid/avctp/avdtp, and spp
3. response frequency: 20-20000hz
4. speaker unit: φ f13 titanium composite film, 32 ω± 15%, 7.118 ± 3db 5mw
5. microphone: 2718 silicon-42 ± 3db
6. charging input standard: contact point, dc4.75-5.25v/600mah
7. battery type: 3.7v polymer battery 500mah with protective plate (3c fast charging battery), earphone battery 30mah
8. charging time: 1 hour
9. headphone working time: tested to play continuously at 100% volume for approximately 5.5 hours
single product bare machine weight: 62.5g
product name: a9 pro