A system includes a reader having a first Bluetooth Low Energy (BLE) device and a barcode scanner having a second BLE device. The first BLE device includes a first advertiser and a first listener, and the second BLE device includes a second advertiser and a second listener. The first advertiser of the reader is configured to broadcast a first beacon signal. The barcode scanner is configured to: detect, by the second listener, the first beacon signal and in response to detecting the first beacon signal, generate an alarm.