SONOTECH 5 Sonotech 5 Wired probe fetal doppler Sonotech 5W Wireless probe fetal doppler (20-30 m) Sonotech 5 Probe : Frequancy 2.5 Mhz Wired probe easy to connectable by socket (in probe and main device") Water proof IPX4 Sonotech 5W Probe : Frequancy 2.5 Mhz Wireless probe 20m (between probe and main device") Built in rechargable battery Record function can be done by probe Water proof IPX4
