Bone Conduction Module or Bone Conduction Sensor or Minimum Bone Conduction Horn for Deafness supplies Package included: 1 x Bone Conduction Module Sensor Specifications: GD01: Dimensions: 21.5x14x7.9mm Power Nominal input 1.5W, Maximum input 3W Average voltage :3.7 V Operate (Max) :12 V Nominal Impedance :4.515 percent test 200Hz 3 v Resonance frequency :300-19000HZ Sound pressure level (minutes) :In the case of 88-1kHz decibels Current consumption (maximum): 600MA Distortion :5 percent less Operating temperature :-20- -60 C Storage temperature: -30- -and70 C GD02 Dimensions Dimensions: 12.6x6x4 mm Power rated :power Nominal input 1 W, maximum power Maximum input 2W Average operating voltage: 3.7 V Operating voltage (max): 8 V Electrical Characteristics: Electrical specification Nominal Impedance Nominal Impedance 815 percent test 200Hz 3 v Resonance frequency :300-19000 Hz Sound pressure level (minutes) :in the case of 88-1kHz decibels Current consumption (max) :300 mA Distortion rate Distortion :5 percent less Working temperature: -20 to 60 C Storage temperature :-30 to and70 C GD05 Dimensions Diameter: 16.8x6.8 mm Power rated:power Nominal input 1W, maximum power Maximum input 2W Average operating voltage :3.7 V Operating voltage (max): 8 V Electrical Characteristics: Electrical specification Nominal Impedance Nominal Impedance 815 percent test 200Hz 3 v Resonance frequency:300-19000 Hz Sound pressure level (minutes): in the case of 88-1kHz decibels Current consumption (max) :300 mA Distortion rate Distortion: 5 percent less Working temperature: -20 to 60 degrees Celsius Storage temperature :-30 to and70 C Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.