E2S Warning Signals has gained VdS approval and CPR compliance to directive 305/2011/EU for its AlertAlarm D112 alarm horn sounder by testing to EN54-3. It combines the field-proven electronics of its AlertAlarm A Series with a robust, corrosion-resistant marine-grade LM6 aluminium alloy enclosure, giving greater mechanical and UV protection. The D112 has a maximum SPL of 119dB(A) @ 1m at the nominal 24V DC fire alarm system operating voltage; the CPR compliance is valid for operation from 18-30V DC. The 48V DC version is also compliant. The VdS approval covers the five most commonly used fire alarm warning tones and also confirms that the units operate to specification under conditions of dry and damp heat, cold, shock and vibration. The aluminium enclosure complies with Type B environmental category making it suitable for outdoor installation, and so supporting the extension of a fire detection system into areas beyond the relatively benign office environment, improving safety. Other tests include EMC, SO2 corrosion resistance and dust and water ingress.