Product name: fs-sr12 compatible transmitters: adapts transmitters with ant protocol, such as fs-st8 compatible models: fixed-wing aircraft, helicopters, gliders, delta-wing airplanes, multicopters, engineering vehicles, boats, robots or cars. Pwm channels: 12 rf: 2. 4ghz ism maximum power: < 20dbm (e. I. R. P. ) ?eu? 2. 4g protocol: ant resolution: 4096 antenna: two antennas distance: > 1500m (air distance without interference) input power: 3. 5~9v/dc working current: 70ma/5v data output: pwm/ppm/i-bus/s. Bus online update: yes temperature range: -10? ~ +60? humidity range: 20% ~ 95% dimensions: 44. 8*32*11. 3mm weight: 13g certifications: ce, fcc id: 2a2unsr1200 (fs-sr12)