Spektrum AR6200 2.4GHz DSM2 Ultralite 6-Channel Receiver Shell material: durable hard plastic.Dimension (W*L*H): about 21.6mm x 30.1mm x 12.3mm. Spektrum Spek AR6200 2.4GHz DSM2 Ultralite 6-Channel Receiver. 6 Channels. Internal and remote receiver. Patented DuaLink technology. ModelMatch prevents flying a model using the wrong model memory (feature does not work with module systems) ServoSync (feature does not work with module systems).