... 210 bpm Resolution: 1bpm Accuracy: +/-1% Operating frequency of the probe: 2.0 MHZ Features:(1)pocket,hand ... conveniently;(2)Cassette holder for sensor,safety in carry,frame in bend,esily for operation,alsocomfortable for pregnant ... woman; (3)Value or curve in LCD display;(4)With data and time or ... woman's SPO2 and pulse(in option);(9)DSP technology,work frequency in 1MHz or 2 MHz,ultrasound ...