Hikvision AX Pro Wireless Internal Sounder - DS-PS1-I-WE/BLUE 

The wireless internal sounder, supporting 868 Mhz wireless communication, Tri-X wireless protocol, multiple enrollment methods, two-way wireless communication, multiple alarm sounds, and strobe light indication, is used for instant alarm alerting. 

• 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 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: 90 to 110 dB
• Fully remote configurable through App
• Multiple enrollment methods and easy installation design
• Frequency hopping against jamming for reliable transmission

Hikvision Data Sheet: 

Please click the link below for full specification 

DS-PS1-I-WE/BLUE