SMAKN&reg; 2.4G 3 Channel 3-CH DSM 2 Surface Receiver for DX3R Radio Rc Car Truck Buggy Boat The HBSR3100 is specifically designed to take full advantage of the advanced DSM2 spread spectrum protocol that Spektrum uses in the DX3R racing system. This means it will provide the fastest response of any spread spectrum receiver, in addition to glitch-free performance. And it gives you all these advantages in a package that is small enough to fit on a 1/18 scale chassis with ease. Type: Race Receiver. Channels: 3. Modulation: DSM2. Band: 2.4GHz.