Wireless Doorbell 2 Push Buttons 2 Receivers, PHYSEN Waterproof Door Chime Kit Operating at 1300-ft, Adjustable 58 Melodies & 5 Volume Levels LED Strobe, Door Bell for Home Office Classroom, Black - Amazon.com
Driveway Alarm, Wireless Outdoor Weather Resistant Motion Sensor and Detector with 656ft Range, 1 Receiver and 2 Sensors