This wireless entry chime from Safety Technology International (STI) is the perfect addition to your home or business. With its easy-to-install design and reliable connectivity, you can rest assured that your home is safe at all times. The STI-3360 model features a wireless range of up to 500 feet and a loud, clear chime that can alert you when the door is opened.Whether you're looking to protect your family or your belongings, this door alarm is an excellent choice. Its compact design and durable construction make it a versatile addition to any home or business. With Safety Technology International, you can be confident that your home or business is safe.