Features: 1.Alarm with "bi.bi." buzzer or human sound and tri-color lamp 2.2~8 pieces different color sensors is available 3.Different type waterproof sensor 4.Sensor could be with waterproof plug, it's convenient to replace sensor 5.Easy installation 6.Alarm volume: 75~90 dB 7.Power(DC): +9~+16 V 8.Operation temperature available: -35~+75 degrees