GROHE F-Digital Bluetooth Adapter 36371000 - The Home Depot
F-Digital® Additional Digital® Controller
F-Digital Additional Digital Controller - Faucets - Amazon.com
Grohe F-Digital 550 CF Setup Starlight Chrome F-Digital Deluxe Steam Shower Setup for Bathrooms up to 550 cu. ft.- Shower Head and Rough-In Not Included - Faucet.com