You can control up to 100 "...with Netatmo" wired products and wireless switches in an installation. Please note the smart gateway will count as 2 devices.
If your installation also includes Somfy iO & RTS connected roller shutters (with Tahoma/Connexoon), Bubendorff radio roller shutters (via iDiamant with Netatmo connexion module), or Smarther with Netatmo thermostat, those products are not included your installation products limit.