Specification Brand : Zopsc BulletPoint1 : TWO WAY TALK: smart voice doorbell, talk to visitors through two way voice intercom, let you know who is visiting your house and talk to them, let them know you are coming or waiting BulletPoint2 : STABLE AND CLEAR: Contain 1 outdoor receiver and 1 indoor transmitter, talk in a wide range through connection, stable makes sound clear BulletPoint3 : WIDE APPLICATION: Widely used in offices and homes, knowing who is outside, convenient for the elderly who need more time to open the door, very practical BulletPoint4 : EASY TO INSTALL AND USE: The visitor presses the outdoor doorbell, after getting the ringtone, just press the on the handset to connect, then long press the call, and release when done BulletPoint5 : TECHNICAL PARAMETERS: frequency for 467MHz, distance up to 200meter without any obstacles IncludedComponents : No ItemName : Intercom Doorbell Kits, Two Way Intercomunicador Door Bell Chime for Home Office, Voice Intercom Doorbell Smart Home Security System ItemPackageDimensions_Height : 3 centimeters ItemPackageDimensions_Length : 16 centimeters ItemPackageDimensions_Width : 12 centimeters ItemTypeKeyword : home-security-systems ItemTypeName : Home Security Systems Manufacturer : Zopsc ModelName : Zopscet9v50aqiu ModelNumber : Zopscet9v50aqiu NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : Zopscet9v50aqiu ProductDescription : 1. TWO WAY TALK: smart voice doorbell, talk to visitors through two way voice intercom, let you know who is visiting your house and talk to them, let them know you are coming or waiting 2. STABLE AND CLEAR: Contain 1 outdoor receiver and 1 indoor transmitter, talk in a wide range through connection, stable makes sound clear 3. WIDE APPLICATION: Widely used in offices and homes, knowing who is outside, convenient for the elderly who need more time to open the door, very practical 4. EASY TO INSTALL AND USE: The visitor presses the outdoor doorbell, after getting the ringtone, just press the on the handset to connect, then long press the call, and release when done 5. TECHNICAL PARAMETERS: frequency for 467MHz, distance up to 200meter without any obstacles