Used condition; may have wear and age related marks. See pics for condition / what’s included / testing conducted. NOTIFIER NCM-F Fiber Network Communications Module 53521A S635 NOTIFIER NCM-F fiber-optic network communications module for compatible NOTIFIER fire alarm network systems. Condition: Used industrial surplus item with possible age/storage/cosmetic wear. Untested unless explicitly stated; see photographs for exact condition and included parts. Please match the exact manufacturer part number, model, revision and connectors shown in the photographs to your application before purchase. Includes x1 NOTIFIER NCM-F Fiber Network Communications Module 53521A S635 per unit unless quantity ordered is greater than one