Lief Smart Patch
DeviceThe Lief Smart Patch is a commercially available, noninvasive wearable heart rate variability biofeedback (HRVB) device. The patch includes an embedded electrocardiogram (ECG) sensor and accelerometer that interfaces with a companion smartphone application to deliver paced breathing exercises and just-in-time adaptive intervention (JITAI) prompts. It is an externally worn patch that temporarily adheres to the skin surface and can be removed by the participant.