The Stinger alarm system has been designed to make the install as simple as possible, with that in mind there are three different options avalible to order. Stinger 300 is a universal after market alarm system that will retro fit to all different makes of caravans. Although supplied with all cables to install the system, an extra harness is avalible seperatilly for this alarm unit. This harness will allow connection to side marker and awning lights. Stinger 310 C is designed for install to Coachman caravans built after june 2009. A harness is supplied with the alarm kit that should plug straight into a four way connector. The connection will supply power to the unit and also allow the awning light to operate when the alarm is armed and dis armed. Stinger 310 S has a harness designed to fit Swift caravans built after september 2009. The eight way plug should fit directly to the road light fuse box. With a spare wire that can be used to trigger a pager or tracker should the alarm sound. By connecting the alarm in such a way the marker lights will flash as the alarm is armed and dis-armed. .