The transducers are rated IP68, for underwater monitoring at 1m depth for up to 5 hours.
Gupta JK , Nikodem VC. Woman’s position during second stage. Cochrane Library (2000)
A. Lawrence , L. Lewis, GJ Hofmeyr, T. Dowswell, C. Styles, “Maternal positions and mobility during first stage labour.”
Cochrane Database of Systematic Reviews (2009): Issue 2. Art. No. CD003934
Flynn et al., “Ambulating in labour,“ Br Med J. (1978) Aug 26, 2 (6137):591-3
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