Built-in modem can dial-up directly,can transmit the fetal heart beat  signal to the Tele- monitor centre via a telephone line;

Pocket BF-500C,have turn off automatically function(3 minutes),built-in battery can be worked more than 5 hours;

Unit weight only 270 gram,with earphone,gallus,convenient to carrying;

Have self-detect function;

5.0MHz option,with portable soft bag