Upgrade version of AR-PB-1A and AR-PB-2A, the exit button will now have three different dimensions (width x length): 41mm x 108mm, 68mm x 108mm (US type), and 86mm x 86mm (EU type). It will have square type button and better sensitivity to make open the door easier. The lifespan of AR-PB5 series is over 100,000 times and also available for customization made by order.