22WV-SFV311/WV-SFV310 WV-SFR311/WV-SFR310WV-SFN311/WV-SFN310Microphone/line input: SF V311 SF R311 SF N311ø3.5 mm monaural mini jackInput impedance: Approx. 2 kΩ (unbalanced)For microphone input: Applicable microphone: Plug-in power typeSupply voltage: 2.5 V±0.5 VRecommended sensitivity of microphone: –48 dB±3 dB(0 dB=1 V/Pa, 1 kHz)For line input: Input level: Approx. –10 dBVBuilt-in microphone: SF N310Electret condenser microphoneAudio output: SF V311 SF R311 SF N311ø3.5 mm stereo mini jack (monaural output)Output impedance: Approx. 600 Ω (unbalanced)External speaker with an amplifierOutput level: –20 dBVWaterproof*3: Main body: IP66 (IEC60529),Type 4X (UL50),NEMA 4X compliantNot supportedShock resistance: Compliant with50 J (IEC 60068-2-75)/IK10 (IEC 62262)SF R311 SF R310Compliant with20 J (IEC 60068-2-75)/IK10 (IEC62262)SF N311 SF N310Not supportedEnclosure: Tamper-resistant enclosureDimensions: Installing using the basebracket:ø164 mm x 139 mm (H){ø6-15/32 inches x5-15/32 inches (H)}Dome radius 42 mm{1-21/32 inches}Installing on a wall or a ceilingdirectly using the attachmentplate:ø154 mm x 103 mm (H){ø6-1/16 inches x4-1/16 inches (H)}Dome radius 42 mm{1-21/32 inches}SF R311 SF R310ø129.5 mm x 102.5 mm (H){ø5-3/32 inches x4-1/32 inches (H)}Dome radius 41.5 mm{1-5/8 inches}SF N311 SF N310ø129.5 mm x 101 mm (H){ø5-3/32 inches x3-31/32 inches (H)}Dome radius 40 mm{1-9/16 inches}Mass: Approx. 1.6 kg {3.53 lbs}(Include base bracket)Approx. 1.1 kg {2.40 lbs}(Not include base bracket)SF R311 SF R310Approx. 660 g {3.2 lbs}SF N311 SF N310Approx. 450 g {1 lbs}