Mô tả sản phẩm: KAL-S304
Firm metal body, Call & 2way communication with residents,
Receiving / Calling audio volume adjustable, 3 + n bus wire connection,
Security alarm connection, Door open through audio handset,
N.O (normal open) / N.C (normal close) door lock connection,
Surface mount , long distance connection (300ms / UTP), Max 40flats connection,
DC12V/1.5A (power supply) is option.
Direct 2 call button (for up to 2 houses) type
