Frequency Response : 20 Hz - 20 kHz Sensitivity : 7.0 mV/Pascal Equivalent Acoustic Noise : 24 dBA SPL Overload Sound Level : 120 dB SPL Operating Current : 500 ¥ìA Operating Voltage : 1 - 2 Volts Power Supply Voltage : +3 V with 2.7 kOhm Load / +5 V with 6.8 kOhm Load / +9 V with 15 kOhm Load Weight : 2g Supplied Accessories: Carrying case, tie clip, wind screen and set of 3 protective caps