The Ring Alarm Contact Sensor is priced at $11.99 today at eBay, which is $3 cheaper than what Amazon charges (and it’s all-time low). Buying two drops the per-unit price to $11.75, and four or more brings it to $11.39 each. Shipping is free no matter how many you buy. Buy Now at eBay
Features
Wireless, battery-operated door/window sensor 2.5″ diameter 130 dB operating sound rating No tools required for installation Compatible with Ring Alarm system (2nd Gen)
