Futaba 4YF 2.4GHz 4-Channel Transmitter FHSS R2004GF Receiver - FUT01004361-3
Futaba quality, FHSS technology and an economical price make the 4YF 2.4GHz Radio an excellent choice for cost-conscious modelers wanting an interference-free spread spectrum system for sport flying. The 4YF has always been a great value – and now it's enhanced with cutting-edge 2.4GHz performance and security! The Futaba 4YF is for use with aircraft models. 
Features:

All-channel servo reversing for more installation options
Power and servo reversing switches located out of the way to prevent accidental changes
Battery meter with green and red LED for instant “go\/no-go” status
Frequency Hopping Spread Spectrum (FHSS) eliminates signal interference and frequency pins
The included R2004GF receiver features a flexible coaxial antenna that can be easily positioned inside the model for optimum reception
Easy, convenient push-button transmitter\/receiver linking, with no binding plugs

Includes:

Futaba 4YF 4-Channel Transmitter
R2004GF Receiver

Requires:

Four (4) AA size batteries – we recommend Admiral NiMH AA Rechargeable Batteries (4 Pack)