The Bird Alert is a simple and powerful tool that will notify you instantly when your Sparrow Trap Door has caught a bird. The Bird Alert saves time, fuel and fleet costs. It promotes safety by reducing the frequency of checking traps in hard-to-reach or hard-to-access locations. Most importantly, the Bird Alert reduces stress on the bird. Quick and easy to set up, the system offers one week of battery life. The optional plug-in battery offers up to 30 days of battery life. The unit adheres firmly to your existing traps. It has its own SIM card, sending messages directly to you through the carrier.