The Grandstream GDS3705 is a SIP door phone intercom, built for users looking for a strong audio-only facility access and security monitoring solution. It can be deployed in environments of all sizes and features a dual microphone and HD loudspeaker. It also supports SIP calls to IP phones and has a built-in RFID chip reader and keypad for secured key-less/key entry. The GDS3705 comes equipped with a zinc alloy metal casing, making it weatherproof and vandal resistant. 

2 mics, 2W HD speaker, Key Pad, RFID reader, IP66, IK10, no PSU