Sonotrim Lavalier for Sennheiser

<Maximum SPL> 134 dB (battery-powered); 148 dB (12V–48V phantom-powered) </Maximum SPL> <Noise> 25 dB "A"-weighted (equivalent SPL at 1 kHz) </Noise> <Source Impedance> 3 kOhm unbalanced 250 Ohm transformer-balanced at output of STR-79 or STR-PS battery supply </Source Impedance> <Internal Powering> 0.9V–20V, positive or negative bias. STR-79 & STR-PS use a LR44H/A76/675/357-type button cell </Internal Powering> <External Powering> 12V–48V phantom-powered (positive bias STR-79+ or STR-PS models only) </External Powering> <Power Consumption> 25µA @ 1.3V (STR-79 or STR-PS battery supply) 95µA @ 6V (12V–48V phantom-powered STR-79+ or STR-PS supply) </Power Consumption> <Capsule Dimensions> L = 0.540", W = 0.300", D = 0.196" </Capsule Dimensions> <Battery Supply> L = 3.250". Diameter, not including clip = 0.750" </Battery Supply> <Cable Length> Approx. 54"  </Cable Length>