Voice of THOR When interfaced with a THOR GUARD, a Voice of THOR provides the ultimate in integrated lightning warning systems for outdoor areas such as golf courses, parks, schools, pools, and beaches. Voice of THOR Air Horns may be automatically or manually activated, alleviating the need for constant monitoring. Easy to install and maintain, each air horn cluster (6 horns) may achieve a 360 degree range of more than 2000 feet. This is three to four times the range of most competitors. The simplicity of 12 Volt power and wireless RF communication between the base and all the remotes make both a RED ALERT & ALL CLEAR easily delivered automatically or manually.