White backlight LCD can display FHR for darkness use:

show the probe working frequency, battery capacity, doppler signal and alarm indicator;

user friendly interface makes easy operation;Output jack can be connect toinstruments ( headset );

Sound amplified and recorded function;

Standard: 3pcs of 1.5v alkaline battery 2HMZ probe,

Optional :3.0MHZ and 5.0 MHZ probes

packing: 
Single Unit Dimension:   24 x 23 x 12cm                          
G W: 1.5kg
20 pcs/Per case
size:  44 x 36 x 42cm                  
G W: 18kg

Lead time: within 3-4 weeks