This mini wireless door / window sensor transmits a wireless signal to the receiver after door or window is opened

• SUB-1G RF frequency with wireless transmission range up to 300m / 1,000ft (direct line of sight)
• After paired with the Multi-Alert Receiver, it can transmit wireless signal to receiver when the door or window is opened.
• Ultra-thin profile <8mm thick, suitable for sliding door / window
• Small in size which can be hidden in an unnoticeable location
• IP4X Water splash-proof designed
• Low battery indication on receiver unit