S point features: single point type (electret capacitor) S frequency response: 50 hz - 16 KHZ S sensitivity: - 38 db / + 2 db (1 KHZ) S output impedance: 1.3 K Ω S maximum sound pressure: 135 db SPL T.H.D At1%1 KHZ S signal-to-noise ratio: 66 db. 1 KHZ AT 1 pa S dynamic range: 111 db. 1 KHZ AT MAX SPL S reference pickup distance: 20 cm150cm S wire length: 6 meters (imbalance) S power supply: DC 9 v