United Security Products United Security ST1 Siren Horn Strobe JMAC# UNITED-SECURITY-ST1 The United Security ST1 is a siren horn strobe that emits a loud siren with flashing red light at remote location upon activation of motion detector. For more information about the United Security Products ST1, please contact us. Comes with a 12 ft... MSRP: Was: Now: $49.60 In Stock Expedited Shipping Available Need it Tomorrow? Need it Tomorrow? Select the NEED IT FAST shipping option at checkout and a member of our team will contact you promptly with any available Expedited Shipping options once we receive your order. Add to Cart