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Serial Wireless Modem 433MHz 100mW (4.8kbps @ 1km range, 500bps @ 1.8km)
#1
Good for some inexpensive RC model control.

http://www.ebay.com/sch/i.html?_nkw=HC-12

Datasheet: http://www.elecrow.com/download/HC-12.pdf another http://avrproject.ru/112/rf_hc12/2016-01..._v2.3B.pdf

Power 3.2-5.5VDC, idle current 80uA-16mA, full power transmitt 100mA 

127 channels 0.4MHz wide, baudarate up to 115200, control via AT commands

Add directional Yagi Antenna and double the range.

Radio: Silicon Labs Si4463 "EZ radio PRO"

CPU: ST STM8S003F3.
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