Supply Of Bearing And Machine Noise Kit (Electronic Stethoscope). Technical Details: - Frequency R Ange:30 Hz - 15 Khz, Operating Temperature: -10 To +45 Degrees C, Output Volume: Adjustable In 15 Levels, Disp Lay: Lcd (Black &White), Sound Volume: Up & Down, Battery Low Signal: Yes, Case Contents: Instrument, Headse T, Probe: 70 Mm And 300 Mm, 2 X Aa Alkaline Battery, Instructions Manual. Make/Model: Skf- Tkst11 Or Equival Ent. [ Warranty Period: 30 Months After The Date Of Delivery ] ]