‹ Sounders and Flashing Warning Lights Armored Anti-Bandit Shroud › OM-5.4.2 Banks should ensure that street-based ATMs are installed with an audible alarm sounder, and a visual flashing warning light, to indicate when the ATM is under attack. Added: January 2020 ‹ Sounders and Flashing Warning Lights Armored Anti-Bandit Shroud ›