This product is a professional radio for drone racer.  Achieved high precision control and the best product for FPV flying.  It provides not only the best control experience but also upgrade in a safety way.  We strongly advice to take out the propellers before any upgrade or fine tuning.  Make sure DO NOT fly in any crowds /breakable/flammable area.                       Specification:(Transmitter)           Brand: Hobbyporter           Model: WT8           Frequency:2.4Ghz           Frequency Hopping: Latest FHSS(64 points,3.6ms)           Channels: 6 channels           Resolution: 4096           Transmission:less than 100mw (20dbm)           Distance: >1000m (depends on actual situation)           Working Voltage:4.2-6v(AAA1.5v*4)           Working current: 100-150mA           Size:162*110*62MM           Color: Graffiti/Flame/Camouflage Color           Application:Helicopter,fixed wing, multi rotor,robot,car,boat                       Specification:(Receiver)           Model: WT8S           Frequency: 2.4Ghz           Frequency Hopping: latest FHSS(64 points, 3.6ms)           Channels: 8 channels           Resolution: 4096            Working voltage:3.8-6v           Working current: 70mA           Protocol: compatible with Sbus,ppm           Size:17*11*2mm           Weight:1.2g           Application:helicopter,fixed wing,multi rotor,robot,car           ATTENTION:           If warning alert signal happens on the radio and the plane Please check your system carefully before taking off.  Please make sure the initial interface is showed to avoid any change in setting accidentally.Turn off the receiver power first then radio power off.To avoid failsafe to hurt anybody.                       Nor/Rev set up:           Remarks: every channel Nor/Rev will be sound and LED indicated                       Set up Steps:           -Turn On: short press the power switch and keep lowest stick           -Enter set up mode:long press Ch5/6 button simultaneously for 10s           -Throttle reverse set up:keep the throttle stick at center and lower the stick to reverse the throttle once           -Aileron, Elevator,Rudder. Move the stick to desired reverse channel           -Nor/Rev Ch5/6. Long press the desire reverse channel for 1s           -Cancel Nor/Rev set up, Long press the Ch5/6 for 3s                       Communication Protocol:           -Sbus/ppm selectable: Led flash rapidly when bind switch is pressed, LED keep solid light on when binding succeed within 30s is Sbus. If Led flash slowly when binding succeed within 30s is ppm           -Receiver signal indication: Normal Sbus signal Led keep solid light on, Normal ppm signal Led flash once every 10s, Led off when no signal is detected.