This alarm is a battery-operated device that can be placed under a door to prevent it from opening. It makes a loud 120db alarm sound when triggered, and has a non-skid surface for easy installation. It is designed for homeowners and renters to secure their doors and deter intruders. Price drops from $24.99 to just $12.76 when you clip the 20% coupon on the product page. Shipping is free for prime members or on orders over $35.

Clip the 20% coupon.