Wireless Door and Window Open Sensor Alarm Chime, 1000Ft Operating Range 61 Chimes Adjustable Volume with Mute Mode LED Indicators Door Open Alert, Door Alarm Sensor for Home Store Office\n\nTimeless & Thoughtful\n\nCalm, Elevated Style\n\nDesigned for Daily Living\n\nKey Features\n\n-- 1000Ft Working Range: Wireless magnetic door and window alarm monitor every areas that you care. This wireless door chime for home is up to 300M/1000 ft in open area, magnetic door sensor will automatically trigger the receiver when the magnetic strip is separated and the receiver will alert immediately whenever the door or window is opened\n-- Kind Reminder: If the pairing between the transmitter and receiver is accidentally cleared (e.g., by long-pressing the volume button), the chime may stop ringing. To re-pair the devices: a. Press and hold the \""Next Chime\"" button on the receiver for over 3 seconds. You will hear a \""ding dong\"" sound, indicating the receiver is in pairing mode. b. Separaten