Features: White Casing with Blue Strobe 109dB Volume Integrated Backup Battery IP44 Environmental Protection Patented Safety Engineer Hold-off Mode Advanced Microprocessor Technology Lid and Wall Tamper Polycarbonate Construction Single Piezo Sounder Selectable SAB/SCB Mode Strobe Tube Saver Twin Alternating LEDs PD6662:2010 Grade 2 Class IV EN50131-1, EN50131-4 Grade 2 Class IV H 310mm x W 196mm x D 58.5mm