BEA 10TD900INDHH4 Four-Button Industrial-Grade-Exterior Transmitter works directly with the BEA 10RD900 Industrial Receiver Module 900MHz to open gates and doors. This model caqn open up to 4. Created generally for use with ADA pushplate and vestibule applications the multiple buttons for multiple portals/entryways makes it ideal for rough industrial settings with numerous doors, gates or other barriers. This transmitter is also NEMA 4-grade: water and wind-blown particulate resistant. Next-generation frequency at 900 Mhz means stronger signal to push past obstacles like partitions and low-emissivity glass and gives extended operating range.