High Quality NEW!!! Dimensions: 9.4 x 4.57 x 2.29 cm Weight: 322 g Frequency: 310-390MHz Compatible Brands: Chamberlain, LiftMaster, Craftman, Genie, Stanley, etc. Compatible Learn Button: Yellow/Purple/Orange/Red/Green High sensitivity sensor Reliable connection & quality History record - Review all the open/close records, check the abnormal actions with trace. Voice Control - Works with Google Home, Google Assistant & Amazon Alexa. REMOTELY CONTROL - Install eHomeLife iOS/android App to open, close, check door status, etc. Also works with Google Assistant & Alexa. ALERTS - Different notification modes to remind you to close the garage door (overtime & overnight notifications) or keep you updated with the door status. EASY INSTALLATION - Follow the user manual or APP guide.