Hikvision DS-PS1-E-WE/BLUE AX PRO Series Wireless Outdoor Sounder  868 MHz two-way wireless communication, Buzzer Decibel: 110 dB  

• 868 MHz two-way wireless communication

• 3 years battery life span (triggered every two weeks and alerting 90 s 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: 110 dB

• Fully remote configurable through App

• Multiple enrollment methods and easy installation design

• Frequency hopping against jamming for reliable transmission

• IP65 protective level