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If there is a whistle (feedback effect), first reduce the power of the microphones, adjusting the corresponding potentiometers with a screwdriver, until an acceptable level is reached. If the hissing sound persists, adjust the speaker volume to eliminate the problem. If the volume is too low, increase the speaker knob first and then the microphone knob, keeping in mind that clear, noise-free reception is better than reception just before the whistle (feedback). Exclusion of call confirmation on the outside station (B) The confirmation tone can be excluded by turning the switch to OFF. IMPORTANT NOTE 1) Before replacing the handset, write down the wires from each terminal on the existing unit (an easy way is to cut each core leaving a piece of insulation in place with visible color) twist the unused cores together (so you know they're not in use, don't short them). 2) Some older systems will have a cable with a colored core and a solid white core in this case, mark each core with a marker or tape. 3) Some systems may have loop wiring, you will have 2 cables in your handset (make sure there are joints left, as they can be used by other systems as they can service other apartments in the system). Gira smart building technology Change program Compatible with the professional video door entry series Bticino (no craft kit) Sprint Audio Handset with Door Release Push Button Call volume can be set to three levels.Does not require any accessories to install on the wall.The secret of the conversation is not available Brand Bticino Color N.a. Unit Count 1.0 Count Dialer Type Single Keypad Item Weight 350 Grams Manufacturer Legrand Model Number 334202 Power Source Corded Electric Telephone Type Corded Item Dimensions 7.87 x 3.54 x 2.2 inches Mfr Part Number 334202 Compatible Devices Bticino Enclosure Material Plastic Is there Caller ID No Recording Capacity 14 Minutes Multiline Operation Single-Line Operation Number of Batteries A batteries required. Answering System Type Digital Conference Call Capability 3 way Global Trade Identification Number 08012199232331 EU Spare Part Availability Duration 7 Years