[Zak] mentions that 433 MHz might have been an option, but he decided to skip that entirely and just connect it to the cellular network with an A9G GPRS/GSM module from A.I. Thinker. This device ...

A new 9-module cabinet offers more storage, convenience and overall value with a capacity of 144 keys if configured as a locking KeyWatcher system and up to 180 keys if configured as a non-locking ...