Three-proof PDA, waterproof and dustproof up tp IP67.4G DMR Walkie-talkie radios OTC-F35

Item No.: OTC-F35
4500mAh battery,Multi-language,Support NFC.Beidou.BT,3.5 inch screen,Support fast charge.
1.DMR enables a single 12.5 kHz channel to support two simultaneous and independent calls. This is achieved using TDMA, Time Division Multiple Access. Under TDMA DMR retains the 12.5 kHz channel width and divides it into two alternating timeslots A and B (illustrated in figure below) where each timeslot acts as a separate communication path.
In figure 1 Radios 1 and 3 are talking on time slot 1 and Radios 2 and 4 are talking on timeslot。
2.Each communication path is active for half of the time in 12.5 kHz of bandwidth, each uses an equivalent bandwidth of half x 12.5 kHz or 6.25 kHz. This is known as having an efficiency of one talk path per 6.25kHz of spectrum. However with DMR the channel as a whole maintains the same profile as an analogue 12.5kHz signal. This means that DMR radios operate in the licence holders existing 12.5 kHz or 25 kHz channels; there is therefore no need for re-banding or re-licensing but at the channel capacity is doubled.
Type Three-proof PDA,  waterproof and dustproof up tp IP67
Bands 2G:GSM B8/B3/B2/B5  3G:TD-SCDMA B34/B39
WCDMA B1/B2/B5/B8  CDMA2000:BC0
 FDD-LTE B1/B3/B4/B5/B7/B8/B20(or B28)
Walkie talkie function DMR    frequencies:400~470  2W
OS Android7.0
Platform MT (8cores 1.6G)
TP G+F+F Capacitive Touch Screen +Gorilla Glass
Storage 16GB+2GB (LPDDR3 666MHZ)
Expansion card Micro-SD cardup to 64G
SIM Dual-sim card (micro-sim card)
Main screen 3.5inch IPS 640x960
Camera pixel Front camera:5MPRear camera:8MP 
Antenna Built-in
Battery capacity 4500mAh
Speaker Φ36mm 2W
M6 expansion port Yes
Calling time 4~6 hours
Stand-by time 250~300 hours
Language Multi-language
Bluetooth 4.0 version
M-sensor Yes
G-sensor Yes
Gyro sensor Yes
Optical sensor Yes
Beidou Yes
Fast charge Yes
USB mass storage Yes