Tropernic smart deadbolt mate with most existing single-cylinder deadbolt, so no need additional drilling, just replace it and play.
The Brand(single-cylinder) that compatable with A220 smart deadbolt:
Smart deadbolt enables App unlock, NFC(wristband unlock) and passcode unlock. While to make the long distance unlock possible, you could mate the deadbolt with a smart gateway, then you could even unlock it from another city. But our passcode is offline stratogy, you could just programme it even without a gateway.
How to install the smart deat bolt
The Smart deadbolt could be installed on most American wooden doors. Door thickness: 35-55mm
Open direction: Either side, left/right hand open
Battery life: More that 6 months
Communication: Bluetooth 4.0
Wi-Fi unlocking: Possible, bridged by Smart gateway