UltraTec PD1+ Fetal Doppler

Pocket doppler with 2 MHz transponder
Built-in heart rate transmitter
LCD display shows fetal heart rate
Integrated speaker
Headphone jack
Volume set via turn knob
Internal signal processing minimises noise artifacts?
Frequenz: 2 MHz
Audio frequency: 300 Hz – 1 kHz
Battery: 9V battery pack
Approx. 9 hours of continuous use with fully charged battery
Transponder attached with spiral cord
ABS plastic housing is easy to clean
Dimensions: 15 x 7.5 cm
Weight: approx. 295 g
RS232 interface?