TABLE 3.

Comparison of wearable device characteristics.

Study	Stimulati on Level	Aesthetic Description	Processing Requirements	Mass	Battery Life	Calibration Requirements	Other Notes
Kim et al., 2020 [18]	Sensory	Wristwatch-style device with disposable electrodes.	Processing completed on external computer, connected via wireless transceiver.	36 g	A 3-hour charge lasts approximately 20 hours.	Initial tests by study personnel to correctly place electrodes and find correct stimulation amplitude.	N/A
Pahwa et al., 2019 [17] and Isaacson et al., 2020 [53]	Sensory	Wristwatch-style device with electrodes built into wristband.	On-board processing whilst stimulation occurs – data for analysis is collected wirelessly from the device whilst charging at a base station.	N/A	A 4 hour charge lasts for 5, 40-minute, stimulation sessions.[78]	Each patient needed to be fitted with a small, medium or large wristband which is specific to R or L hand. Study personnel manually increased stimulation amplitude initially.	The wristband must be replaced every 3 months. The cost of this device is USD$3200+$157 monthly band subscription [78].

Note: N/A = not available