MR3000 Marine 2.4GHz 3-Channel Receiver 

Leave it to the folks who have pioneered more ways to use 2.4GHz RC than anyone else to develop the ideal solution for boat modelers. The result of years of research and testing, Spektrum’s 3-channel MR3000 Marine 2.4GHz receiver uses a unique signal protocol built into new DX3S transmitters that has been optimized specifically for marine use.
Features that can’t be found in any other receiver make Spektrum’s MR3000 the perfect choice for RC boating enthusiasts. Specifically designed for boating applications, it offers 3 channels – throttle, rudder and an auxiliary channel that can be utilized for a variety of applications, including mixture control on nitro boats and throttle kill on gas boats. The MR3000’s water-resistant case protects its circuitry from water and prevents corrosion, while its compact design allows for simple, clean installation in most applications.
The MR3000 is compatible with new DX3S transmitters (SPM3140) featuring the marine logo. If your DX3S has the Marine logo (located on the back side of the transmitter below the Spektrum logo), then it is compatible with the MR3000.  The MR3000 is also compatible with Spektrum and JR® DSM2™ aircraft radios.

Telemetry: None

Key Features
-3-channel Marine-specific receiver
-Dual outputs on steering and throttle
-Water resistant enclosure
-Dual switching feeder antennas
-Preset Failsafe system
-QuickConnect

Channels:   3 (plus dual throttle and steering outputs)
Modulation:   Marine
Band:    2.4GHz
Dimensions (WxLxH):  0.75 x 1.3 x 0.2 in (19 x 34 x 5mm)
Weight:   0.2 oz (6 g)
Voltage Range:   3.5-9.6V
Antenna Length:  14 and 8 in