ESS260R. The ERA Solar Charged Wireless External Siren is compatible with all ERA wireless alarm systems and can also be used as a stand-alone system by simply adding optional ERA accessories such as PIR Sensors, Magnetic Sensors and Remote Controls. It is easy to install and tamper protected, with a loud 110db siren featuring adjustable duration, plus strobe lights which flash during an alarm condition.. Solar Panel Powered for External use (charges battery even on overcast days). No mains power required. Fully weatherproof. Tamper Protection