Validation of minute-to-minute scoring for sleep and wake periods in a consumer wearable device compared to an actigraphy device

Table 1 Comparison of consumer- and research-grade actigraphs

	Amazfit Arc	Philips Actiwatch Spectrum
Cost^a	$70	$900–1000
Accelerometers	MEMS tri-axial	Piezo-electric tri-axial
Accelerometer sampling rate	25 Hz	32 Hz
Weight	20 g	31 g
Recording time	30 days	60 days
Battery life (one charge)	20 days	60 days
Light sensor	None	Yes

ISSN: 2398-2683