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Absolutely! The Losi MRX-3000 is completely compatible with all Spektrum Surface radio systems.
Binding is the process of training the transmitter and receiver to communicate with each other. Each radio and receiver have a unique code, called a GUID (Global Unique Identification Code) Code. This is your radio system's thumbprint that prevents it from interfering with other radio systems or being interfered with by other radio systems.
Anytime you purchase a new receiver it will need to be bound to your radio. Also if you are transferring a receiver from one car or truck to another and entering that model into a new model location you will need to re-bind it due to ModelMatch.
ModelMatch is an exclusive Spektrum feature that prevents the radio system from operating if the incorrect model profile is selected from the model select screen. Each model location is given a secondary code on top of the GUID coding that mates that receiver to that specific memory location. If that code is not found the ESC will not recognize the transmitter, remaining in the failsafe mode. Both the DX3S and DX3R surface transmitters feature ModelMatch.
A failsafe is a safety feature designed into Spektrum receivers that drives the servo or ESC positions to a preset location in the event that signal is lost. Typically you should set the failsafe so that if there is a loss of signal, full brakes are applied. This will help prevent runaways and possible damage or harm to those around you.
This multi-answer question is all-dependant on what radio system you have. First of all, you can only use surface receivers with surface radios; the air receivers are not compatible with the surface systems and vice versa. Secondly, you need to know what transmitter you have. Please see the matrix below to determine what receivers will work with your particular radio system.