Meet the CoinGuard System: an alarm system with a coin-sized wireless sensor and a beacon to send you smartphone alerts when your valuable items are moved. The iHomeware Beacon is a small device that you can carry to help the security system figure out when to arm or disarm. The iHomeWare cloud makes sure you are always connected to your security system.
CoinGuard is easy to install and set up. Its sensor detects movements and vibrations and alerts you. You can get your hands on it for under $100 at this time.