A print multiple layers paste, soft, breathable, skin-friendly. The paste is design integrated with main part, also involved three electrodes, no wire connection. Not only wearable, really forgettable. Less than 20 g, senseless when wearing. Paste on sternum, where no muscle under skin, to ensure the signal will not influence by daily active. Maximum 72 hours wave could let the doctor easily track the occasionally abnormal signal. Due to the powerful attachment capabilities for iPad, the doctor can easily locate the potential problem spot, edit and analyze it. When the user feels uncomfortable, he just presses the device, so the info will be marked and highlighted to the doctor.