Waterproof Shockproof Dustproof, 2400mAh Battery, 2.2. inch, 21 Keys, LED Flashlight, FM, Quad SIM, with Antenna Others Accessories the audio signal transmission gain

the audio signal transmission gain reduces the antenna

27inch * 1

Frequency Response 20Hz-20kHz

Dimension: 249

Function introduction: sleep light

Waterproof Shockproof Dustproof, 2400mAh Battery, 2.2. inch, 21 Keys, LED Flashlight, FM, Quad SIM, with Antenna Others Accessories the audio signal transmission gain1. Four cards and four standby, no need to switch 2. Retractable and detachable antenna to enhance mobile phone signal 3. Phonebook 500, contacts can be grouped, SMS 200 4. 9 groups of family dial: Contacts options others speed dial 5. The earpiece is very loud, which is very suitable for people with poor hearing or sound requirements, noisy people, etc. 6. Multimedia: DV, video playback, recorder, camera, calendar, alarm clock 3 groups, computer,