| Specification | 
                 
                  | 125SR250 | 
                  Transceiver | 
                 
                  | Center Frequency | 
                  125.0±10.0 KHz | 
                 
                  | Bandwidth Echo  Sensitivity -6dB | 
                  8.0 KHz | 
                 
                  Echo Sensitivity 0dB re 20Vp-p sine wave, 40 bursts @ 25cm | 
                  -57 dB min.  28 mVp-p min. | 
                 
                  | Dead Zone 10 Bursts | 
                  20 cm | 
                 
                  | Capacitance at 1KHz ±20% | 
                  1250 pF | 
                 
                  Max.Driving Voltage Pulse 2% duty cycle tone burst | 
                  200 Vp-p | 
                 
                  | Total Beam Angle -3dB/-6dB | 
                  8.0°/11.0° typical | 
                 
                  | Matching Window | 
                  Silicone Rubber | 
                 
                  | Operation Temperature | 
                  -20℃ to 60℃ | 
                 
                  | Storage Temperature | 
                  -30℃ to 70℃ |