To ensure that your Snooper S4 is always effective, speed camera downloads can be performed as often as the user prefers. An optional external modem can also be purchased for users without access to a PC, so that the speed camera database can be downloaded from any compatible telephone socket. The Snooper S4 then compares your position using it's built-in Sat Nav GPS antenna, with the position of every known fixed speed camera system and accident hotspot alerting you both audibly and visually via a speaker and it's LCD text display ensuring your highest concentration at all times. The Snooper S4 is also equipped with a user selectable speed limit alert system so that the device can be programmed to alert you to any pre-determined speed you choose. Acting as a constant reminder of the current speed limit.