YM-350N(LED)-DS-UL,Inbuilt dry contacts lock status signal output ( NO,NC,COM), door status signal output ( NO,NC,COM) is the main difference. LED indicator is reserved . And the holding force is 800lbs. Has been certified by UL294 &1034 In terms of safety, durability and environmental adaptability of the product, it has been tested by the world's most stringent standards,providing architects, consulting engineers, system integrators and end users with authoritative and objective product performance and quality assurance.