Wireless Manual Call Point (manual alarm button, fire alarm system) Wireless Manual Call Point (manual alarm button, fire alarm system)1. Operated with single 12V ... and easy to install3. Working frequency: 315MHz / 433.92MHz4. Press button with moderate force5. Extra loud alarm sound over 100 dB6 ... VST-HS20087. CE approved,UL217Stand,BV ISO9001:2000 Wireless Manual Call Point