Hate to say but Nomadio knows what they are doing when it comes to Spectrum Nomadio has been doing for a long time. Check out there site and see just how this came about, pretty interesting...
This is taken from SMF:
Nomadio Sensor 2.4GHz System w/Sensors - #100
[NOM100] $374.99 $349.99
In Stock
This is it, the real deal, the one everyone's talking about! This is the full Nomadio Sensor 2.4GHz setup, including: transmitter, transceiver, temperature sensor, voltage sensor, speed sensor, USB cable, rechargeable batteries, battery charger, user manual, and software CD! U.S. version only.
More from Nomadio:
NO MORE CRYSTAL RADIOS OR FREQUENCY CLIPS
Sensor uses digital 2.4Ghz spread spectrum radio technology. Just like your cell phone, Sensor finds a clear channel automatically without you ever having to deal with frequency crystals or glitches again. Unlike clumsy “bolt on†DSS radios, Sensor’s is built to take advantage of DSS speed and accuracy.
REAL TIME TELEMETRY
Sensor’s digital radio is two way, not one way, like crystal radios. That means that for the first time, with optional sensors, Sensor gives you real time reports of the condition of your car while you are driving it, such as speed, temperature and battery voltage. Also, the system is expandable and we will be releasing several exciting new sensors over the coming year. Unlike clumsy “bolt on†telemetry systems, You'll never have extra boxes and wires to contend with... Sensor’s is fully integrated into the controller.
HEADS UP COMPETITION DRIVING SYSTEM
Sensor gives you important alerts about your car without requiring you to take your eyes off the track. It does this with an integrated sound and vibration system that allows you to program what you want to know and how you want to be told. You can use headphones to keep your alerts private, too.
BRAINS AND BANDWIDTH IN YOUR RC CAR
For the first time, there is a microcontroller brain in your RC car. This breakthrough will enable all sorts of new and interesting capabilities for RC. For example, there is no need to spend money for a dedicated failsafe unit - Sensor's is built in. The onboard microprocessor knows what to do in the event of a loss of communication. This sort of thing is impossible with "dumb" analog crystal radios.
IT’S RIDICULOUSLY FAST
Sensor’s design team optimized its digital brain for incredible speed and accuracy. The system sends control and telemetry updates to and from the car 100 times per second, with a resolution of 4096 steps per channel.
IT’S A PC-CONNECTED PERIPHERAL
Sensor was designed to use your PC to make it incredibly easy to program, back up, analyze, and update. Once you register your Sensor at Nomadio’s web site, we’ll automatically tell you when new software is available to add or improve functions on your Sensor. No other RC product offers Sensor’s future upgrade capability. There will even be a developer’s kit to allow third parties to develop software and expansion hardware for the Sensor system.
This particular radio has everything you could ever think of, Cost I have yet to find one for less than what SMF sells it for.