ECCO's most compact and popular line of back-up alarms, the 500 series provides a cost-effective warning solution with ECCO quality and reliability. A glass filled nylon housing with epoxy encapsulated electronics provide exceptional durability and protection against moisture, dust and vibration. ECCO's 500 series Smart Alarm measures ambient noise and adjusts sound levels, creating a volume that is safe without being annoying or contributing to noise pollution. Smart alarms eliminate the need for constant manual adjustment and help prevent intentional alarm disconnection.