Hd 202 2 headphones

Data were collected with two sets of Samsung Galaxy Pocket Plus S5301 phones running the hearScreen™ Android OS application with supra-aural Sennheiser HD202 II headphones (Sennheiser, Wedemark, Germany). As the hearScreen™ application (under investigation) is not intended to be an end-user application it requires objective calibration on pre-selected smartphone models standardised for testing. Thus before data collection commenced, headphones were calibrated on the hearScreen™ calibration function according to prescribed standards (ANSI/ASA S3.6-2010; ISO 389-1, 1998) for TDH 39 supra-aural headphones (see Swanepoel et al., 2014 for detailed description). Furthermore, the smartphone hearing screening application monitored and recorded noise levels during data collection for each child.
Previously published work indicate that noise monitoring using this application on these smartphones is accurate within 1 and 1.5 dB, depending on the frequency (Swanepoel et al. 2014) . Recorded noise levels consisted of the averaged ambient noise recorded by the smartphone during the pure-tone presentation (1.2 seconds duration) in the octave band corresponding to the test frequency (see Swanepoel et al. 2014) . Smartphones were connected to a 3G cellular network whereby screening results were uploaded to a database at the end of each screening session.