Mace Security MAS-AWD2PK MaceAlert SOLO Window and Door Alarm Compact all-in-one security alarm with built-in magnetic contacts and 110dB siren for basic security of window, door, or cabinets Easily switch between ALARM siren mode for deterrence against unwanted intruders or Chime sound mode for simple notification when an opening is detected Each sensor operates independently with simple switch settings for OFF, ALARM, or CHIME mode and a battery test button all concealed under front cover Convenient 2-pack, each sensor includes (4) x LR44 alkaline batteries and self-adhesive pads for easy surface mount installation Mace Security 12-month limited product warranty with USA-based, toll-free telephone technical support