Futaba 4PX 4-Channel FASST, T-FHSS, S-FHSS 2.4GHz Computer Radio Control Transmitter with Telemetry and R304SB Receiver Easy-to-use color LCD display  monitor lap times and battery voltage without scrolling through multiple menus. Measures 3.5 inches (89 millimeters). FASST, T-FHSS and S-FHSS compatibility allows you to use the 4PX with any of your favorite Futaba 2.4GHz receivers. Offers 31 telemetry sensor slots plus a synthesized voice for hearing telemetry data through the built-in speaker (sensors not included). Customize the 4PX to your touch with the drop-down steering wheel option and two trigger choices with tension and position adjustments. Lightweight and comfortable to hold throughout a race, with fast response time that improves your control at critical moments.