I will disclose that I sell them but it is an outstanding sequencer and very flexable. You can do any sequence and timing with it. It will know if your gear switch is in the gear up position when you turn on the transmitter and not raise them until you cycle the switch. You can select doors open when the gear is down, doors closed when the gear is down or have the main gear doors open and nose gear door closed or visa versa. It is also in a very small package.