I found this info on the 2-way fobs......
Introducing the innovative 2-Way Advanced Remote Start. Now available for select GM vehicles (see below for detailed vehicle application information). The 2-Way Advanced Remote Start allows customers to upgrade their factory keyless entry or factory remote start systems to provide enhanced functionality. In addition to extended range remote keyless entry*, extended range remote vehicle start, and standard functions like door lock/unlock, vehicle locator/panic alarm and power liftgate open/close (if vehicle is equipped), this new accessory also features technology that allows 2-way communication between the key fob transmitter and the vehicle.
The key fob transmitter provides immediate visual and audio confirmation that a key fob command (like start vehicle, lock/unlock doors, etc.) was received. The large, easy-to-read LCD screen displays status/data when within range of the vehicle such as Fuel Level, Tire Pressure, Odometer Reading (accurate within 1 mile), Clock/Remote Start Countdown Timer, and Key Fob Battery Life Indicator. Customers with vehicles equipped with steering wheel controls (UK3) can even scroll through their pre-set radio stations.**
* Up to three times as far as factory remote keyless entry
** excludes HHR and G6
Immediately for all vehicles listed below except HHR. The 2-Way Advanced Remote Start for HHR will be available shortly.
Fits specific makes/models.
Antenna location varies by vehicle make/model.
Key fob can be programmed to control a second vehicle if that vehicle is also equipped with 2-Way Advanced Remote Start.
If reprogrammed, factory key fobs remain operational (except HHR & G6; 2-Way Advanced Remote Start kits for these vehicles include one new factory-style key fob to replace the factory fob).
To preserve battery life of the 2-Way Advanced Remote Start key fob transmitter, the image on the screen remains illuminated for approximately 5 seconds. To recall image to the screen, simply press any button once. To illuminate backlighting, press one of the side buttons once.
Important Installation Information:
• Estimated installation time: 1.1 – 2.3 hours, depending on vehicle
• Installation instructions available via Service Information (SI) website
• Requires service programming and scan tool
• Adhesion promoters are not included in kits. Order GM part number 12378555 for glass surfaces on '08 HHR and all full-size SUVs, or
12378462 for all other surfaces on all other vehicles.
• G6 requires a small piece of felt/flocking tape which is not currently included in the kit. Call 1-800-654-6333 to order BSR part number KT13296.
GM Accessories permanently installed at the time of new-vehicle delivery are covered under the New-Vehicle Limited Warranty. If installed after delivery, coverage (parts and labor) is for the balance of the New-Vehicle Limited Warranty, but not less than 12 months or 12,000 miles (whichever comes first). GM Accessories not requiring installation or purchased over the counter carry a 12 month limited warranty (parts only).
This product is also covered under GM Protection Plan (GMPP) Major Guard and Smart Protection vehicle service contracts. Please refer to the current GMPP administrative guide for coverage details.
If you have additional questions, please contact your District Parts Manager (DPM) or Regional Division Marketing Manager-Accessories (RDMM-A).