Cheapest Interphone long range with VOX function walkie talkie

Cheapest Interphone long range with VOX function walkie talkie AC-666S
1.frequency:400-470MHz
2.16 channel
3.talk range:6km
4.vox function
Function:
1.50 CTCSS/105 CDCSS
2.VOX Function
3. Voice Prompt
4. PC Programming
5. Emergency Alarm
6. Intelligent Charging
7. Battery Save
8. Low Voltage Alert
9. Time-out Timer
10. Torch Light
11. 16 channel
12. Busy channel lock
13. frequency:400-470MHz
Frequency Range: UHF 400-470MHz
16 memory channels 50 CTCSS/105 CDCSS
VOX Function PC Programming
Voice Prompt Emergency Alarm
Intelligent Charging Battery Save
Low Voltage Alert Time-out Timer(TOT)
Torch Light. Battery (Li-ion 3.7V)
Busy channel lock Chinese and English voice prompt
Item number AC-666S
General
Frequency Range 400-470MHz
Channel No. 16
Frequency Stability ±2.5PPm
Antenna High gain antenna
Antenna Impedance 50Ω
Operating Voltage DC 3.7V(Rechargeable Li-ion battery)
Mode of operation Simple or semi-duplex
Dimensions(W×H×D) 110× 50× 32 mm
Transmitter
Output power 3W
Modulation Mode 16kΦF3E/ 11kΦF3E
Maximum deviation <5kHz/<2.5KHZ
Spurious Radiation <7μW
Adjacent Ch. power ≥65dB/≥60db
Pre-emphasis characteristics 6db
Current ≤1.6A(5W)
CTCSS/DCS deviation 0.5kHZ+/-.01kHZ 03kHZ+/-0.1kHZ
Intermediation sensitivity 8-12mv
Intermediation distortion <10%
Receiver
RF Sensitivity -122dbm(12db SINAD)
Audio power >0.5W
Audio Distortion ≤10%
Intermediation ≥60dB ≥55db
Selectivity ≥65dB ≥60db
Spurious Rejection ≥65db
Blocking ≥85