For using this device as a Chime, this is a more appropriate app than LUM. It’s designed to handler multiple sensors (and chimes) and do a lot many more types of notifications:
[RELEASE] Enhanced ZigBee Keypad - Centralite Keypad, Lowes IRIS Keypad, UEI Keypad and Xfinity Keypad Device Handler
RBoy (www.rboyapps.com - Make your home your butler!) #144
For those looking for weatherproof plastic mounting boxes to work with the UEI/Xfinity XHK1, I settled on the Arlington DBK88W and DBK88C. I really wanted to use the 5" square version but the XHK1 measures an 1/8" too big.