... , which houses super bright led cluster, piezo speaker and SCM control circuit, providing waterproof, shockproof, high luminous, stable performance, lightweight and ... or deviceSupply voltageAC220V DC20V~DC30V (Optional)Rated current< 1AFrequency50Hz~60HzControl signal levelDC20V~DC30V+IP ProtectionIP65External cable length200mmAlarm toneA / B / DOperation modeContinuousLamp ...