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 DC battery2. Wireless network, ... 315MHz / 433.92MHz4. Press button with moderate force5. Extra loud alarm sound over 100 dB6. Working with VST-WS588I or VST ... VST-HS20087. CE approved,UL217Stand,BV ISO9001:2000 Wireless Manual Call Point