RF 433Mhz Transmitter Module Kit for Arduino ARM Launch Distance 4000 Meters
DC 9V RF 433Mhz Wireless Remote Control Transmitter Module Kit Large Power
Specifications:
Product Name:4000 meters wireless transmitter module
Size: (L x W x H): 49 x 30 x 10mm/1.93 x 1.18 x 0.39in
Operating current: >100mA
Working voltage: DC 9V
Working frequency: 433MHz
Launch distance: 4000m (open environment without interference)

Included:
1 x 4km Wireless Transmitter Module