DAHUA Emergency Break Glass Button ASF921 has a Photoelectric control technology to prevent the mechanical failure, Ultra-low temperature design, not only is it more safe, it’s also more durable. It has 500,000 electricity aging test, Built-in reverse current protection circuit in case of high current and it also comes with an in-buit microprocessor chip control circuit.

DAHUA Plastic Exit Button 86 Box ASF900

is built with Professional circuit design, no mechanical failure it uses fire retardant material, convenient installation, normally open/closed functions, flexible application. It has 500000 times fatigue test and durability, Access control project designated accessory products