Mace Security MAS-WA-SIR MaceAlert SOLO Extension Alarm Siren System Expansion Accessory Additional wireless siren for extending alarm sound range and deterrence perimeter Use in areas where the main system's built-in alarm siren may not be heard 120dB+ siren with flashing LED Includes (1) siren with AC power adapter, anchors, screws, and product manual, requires (3) x AAA alkaline batteries for back-up power (not included) Mace Security 12-month limited product warranty with USA-based, toll-free telephone technical support