Check the listing for details. Sonim XP3 w/ 4″ PTT Kit and Locking Cradle Post and Hardwire Kit NEW. Condition: New. Listed at 129.98 USD. PTT Kit and Locking Cradle for Sonim XP3 w/ 4″ Post and Hardwire Kit$349.95 – $359.95Simple to Install and Easy to Use. For Sonim XP3GPSLockbox’s Push-To-Talk Car Kit provides an economical solution for commercial vehicles and drivers to maintain hands free compliance and communication with dispatch and direct connect groups. Simple to install and easy to use, we assemble our PTT Car kit complete with cradle, amplifier, loud speaker and palm microphone. Just mount in desired location and connect power so your drivers have one touch direct connect with dispatch. Available with hardwire kit so system can be connected directly to vehicles electrical system or with CLA adapter for quick installation without any electrical work.