The TR-P200SE has a smart design with simple, single button activation. LED flashes on all transmissions, including supervision, so the user is reassured the unit is operating. It comes with a belt clip that can be converted to a belt loop. It can also be easily mounted for fixed-position signaling. Operation: When used with Cornell System, this wireless devices LED screen flashes with all transmissions, including supervision. Options: Cornells TR-P200SE device: Comes with a neck cord Can easily be mounted for fixed position signaling Includes customer-replaceable 3V Lithium battery UL approved Mounting: Neck Cord Provided. Engineering Specifications: The contractor shall furnish and provide the CORNELL TR-P200SE Fixed Button Transmitter as indicated on the plans. Fixed Button Transmitter shall be programmed to AURA 2.0 following specifications. Transmitter shall be provided to user with provided neck cord. Technical Information: Dimensions: 3 x 1.6 x 0.72 Weight: 1.7 oz Power: 3.0V Lithium Battery Replacement: CR2 lithium battery Battery Life: 3-5 years Operating Environment: 50-120°F Indoor Non-condensing