? FHR detection from 10-weeks pregnancy up to delivery. ? Matched with waterproof probe for parturition under the water. ? Apply AGC(Auto Gain Control) function to get accurate FHR ? Background light to make FHR read easily ? Menu option for accurate FHR detection in transient, average and manual FHR ? Function on volume adjustment and button click sound. ? Compatible with Alkaline and rechargeable battery. ? Audible and visual alarming for abnormal FHR ? Automatically power-off for no signal received within 2 minutes to save energy ? Link with earphone ? Build-in speaker.