The product description provided by the supplier is:

Properly inflated tires are key for safe and smooth operation on any aircraft. Checking tire pressures can be time consuming and a major inconvenience to both crew and passengers, all depending on environmental conditions and/or ease of access to the valve stem. iPRESS™ is the retrofit solution to make checking tire pressures as easy as answering a phone call. 

iPRESS™ consists of the Parker-Meggitt’s WTPS (Wireless Tire Pressure Sensor) assemblies transmitting aircraft tire pressures to your smart device (iOS), via a tire pressure gauging feature integrated in your aircraft manufacturer’s APP. WTPS assemblies are mounted on each aircraft wheels. They are made of Parker-Meggitt’s smart Pressure Sensor Device and Pressure Sensor Holder replacing the original wheel valve stem.

*Check back often as new aircraft models are added

More information located at link below:

https://www.meggitt.com/insights/wireless-tyre-pressure-system-wtps

To purchase parts directly from Textron Aviation Parts Distribution:

• P/N 281-401-001-001 – Model 510 and 560XL (Note: At this time, the 560XL shipset is only compatible with main wheel P/N 3-1571-6)
  • https://ww2.txtav.com/Parts/PartSearch/PartsDetail/281-401-001-001
• P/N 281-402-001-001 – Model 525C
  • https://ww2.txtav.com/Parts/PartSearch/PartsDetail/281-402-001-001