from the pictures of both it looks like the 320 are alot bulkier/bigger than the ones that comcast offers. dont know if that's something that matters to you or not. also from the visonic website says its for a powermax system, not xfinity. so whether or not that device is on the same wireless frequency (aka combatible or not) i honestly dont know. here is visonic sales number 800-223-0020 or if western us 877-776-7377 or eastern us 866-464-2288 email addresses are info.us@visonic.com and orders.us@visonic.com with hours of operation between 8:30am-6pm est. you could try contacting them and asking if its compatible or contact comcast as well. but usually with comcast for compatibility they usually just say we would need a tech to try to incorparate it to figure out if it works or not
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