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Best Choice New Ring Alarm Contact Sensor (2nd Generation) - 2 pack Get real-time notifications the moment a door or window opens in your home.New Ring Alarm Contact Sensor (2nd Generation) Get real-time notifications the moment a door or window opens in your home.New Ring Alarm Outdoor Contact Sensor Help secure gates, sheds, garages, windows and outbuildings with Ring Alarm Outdoor Contact Sensor.Best Value New Spacer | Riser Compatible with Ring Alarm Contact Sensor (0.25 Inch) Riser attaches to your current sensor, no additional magnet required.New Ring Alarm Pack - M by Amazon | Smart home alarm security system with optional Assisted Monitoring - No long-term commit This Alarm Pack is ideal for 2 bedroom homes.New Ring Alarm Pack - S by Amazon | Smart home alarm security system with optional Assisted Monitoring - No long-term commit This Alarm Pack is ideal for apartments and 1 bedroom homes.New Spacer | Riser Compatible with Ring Alarm Contact Sensor 2 Pack (1 Inch) Riser attaches to your current sensor, no additional magnet required.New Ring Alarm Glass Break Sensor Monitor glass windows and doors for break-in attempts with Ring Alarm Glass Break Sensor.New Ring Alarm Pack - L by Amazon | Smart home alarm security system with optional Assisted Monitoring - No long-term commit This Alarm Pack is ideal for 2-3 bedroom homes.New Door Alarm, Window Alarm, Koostone Wireless Ring Contact Sensor, Door Sensor for Home, Kids, Elders and Pets, Door Alarm 【AAA Battery Wireless Door Sensor Alarm】>>-This door chime is desiged for very easy operation, it has 120dB alarm volume