Hikvision DS-PS1-I-WE(B)/Blue/Black

868 MHz two-way wireless communication; Configurable arming/disarming prompt sound and LED indicator; 3 years battery life span (triggered every two weeks and alerting 90 sec for each triggering); AES-128 encryption; Front and rear panel tamper-proof; 3 kinds of alarm sounds: fire alarm, panic alarm, and intrusion alarm; Buzzer Decibel: 90 to 110 dB; Fully remote configurable through APP; Multiple enrollment methods and easy installation design; Frequency hopping against jamming for reliable transmission;