... easy indoor and outdoor communication.Electric doorplate, three-in-one doorbell, four-in-one doorbell, big room number doorbell, disc ... We already ODM for some famous brands in the worldAdvantages:1. Touching panel is weak electricity,much more safer.2. ... plastic frame too.Plastic: Hotel doorbell (touch panel)/Hotel doorbell system/ hotel room control panel/electrical hotel bell/door chime/door bell