Feature:
1 . The unique design of the retractable cable function of the earpiece is more convenient, and there is no need to put the earphone on the ear for a long time.
2 . Call vibration reminder function.
3 . Smart voice reminder, caller ID number.
4 . Bilingual switching between Chinese and English.
5 . Headphone battery display, better understand the headphones.
6 . One for two, two phones can be connected at the same time.

Detail:
Size : 55*27*15mm/2.17*1.06*0.59inch
Speaker size : 10X4mm/0.39x0.16inch
Microphone size : 4X1.5mm/0.16x0.06inch
Music time : about 4 hours
Talking time : about 5 hours
Standby time : about 80 hours
Distance : 10m
Battery Specifications : Rechargeable Polymer Lithium Battery (601515/ 80MAH)
Version : 4.0
Chip : CSR 8615|
Charging voltage : 5V
Transmit power : Class 2 (-6dbm-4dbm)
Working voltage : 3.7V
Working frequency : 2.402-2.480Ghz
Speaker impedance : 16± 15%
Sensitivity : 95 +-3DB
Frequency range : 50-20KHZ
Rated output power : 3mW
Maximum output power : 5mW
Microphone sensitivity : -42 +/-3db
Charging time : about 2 hours
Low power shutdown voltage : about 3.2V

Includes:
1 x Fineblue F920 Earphone