Sirena interior wireless AX PRO Hikvision DS-PS1-II-WE Buzzer Decibel: 90 to 110 dB, fire alarm, panic alarm, and intrusion alarm, Operation temperature –10°C to 55°C,Four CR123 batteries, Support 12 VDC Power Supply, Power interface 12 VDC, CAM-X Wireless Technology ,Dimension:130 × 128 × 39.5 mm, Weight 361.0 g . Blue indicator