The Inovonics EN1235SF single-button fixed position hold up transmitter features a rugged design with simple, single-button activation, and a back tamper for tamper protection. The hallmark of reliable and secure alarm signaling. Single-button activation coupled with tamper protection and a rugged design makes this fixed transmitter perfect for any security environment. Also known as -Inovonics EN1235SF Single-Button Fixed Position Hold Up Transmitter