• It transmits a wireless signal to 'Driveway Alert' receiver to remind you the garage door opened or remains opened after 3 mins.

Key features and specifications:

• Simple operation, no installation.
• Use 868mHz/915mHz frequency.
• Transmits range up to 300 meter / 1,000 feet (direct line of sight), subject to the receiver.
• Random pairing code avoid interference.
• Low battery indicator on receiver.
• Package includes double sized tape and mounting kids.
• Low power consumption.
• Uses 1 pc DC12v 23A battery (included).
• Compatible with 'Driveway Alert' and 'GUARDMAN' receiver: MA-1000, DCX-800 and DCX-25.
• Comply with FCC, CE and R&TTE requirement.