Size: W174 x L89 x H190mm No. of Channels: 4 Control Resolution: 1024 Frequency: 2.4GHz Band (2405.5-2475MHz: 1 40ch) System: FHSS System Power Supply: AA Alkaline Battery x4 Antenna Output: 1.5mW/MHz Radio Waves Reaching Distance: Air: 500m / Above Ground: 300m / Above Water: 150m [Set Contents] -KT-431S transmitter -KR-431T receiver -Receiver battery box -Receiver switch -Handing connector -Instruction paper