Features ? 12.1?? colour TFT display screen ? 12 elements doppler transducer ? Monitoring parameters: FHR, FM and UA ? Rotatable screen, easy for viewing from different direction ? Built-in thermal printer, the size can be 112mm,150mm or 210mm ? Automatic monitoring fuction with parameters presetting ? Can playback 48 hours monitoring data ? Rechargeable Li-ion battery ? Built-in network function ? Twins monitoring (only for FM-322)