Multifunctional, wearable, personal electronic devices comprised primarily of software and color and non-color display screens that are compatible with smartphones or tablet computers for displaying data, namely, the number of steps taken, tracking distance traveled, the number of calories burned, the distance between two points, the time, the number of stairs climbed, received and sent text messages, incoming and outgoing phone calls, missed recorded messages, emails, photos and data from other smart phones and tablet computers, notifications of text messages, calendar appointments, transmitted electronic documents, and also for manipulating text and image files, sending and receiving emails and text messages, making and receiving phone calls, recording messages, transmitting tracked activity data and documents, playing games from the device itself, and playing games while connected to other mobile devices either wirelessly or with connection cables; activity tracking device, namely, pedometers