Royal TimePilot Time Management System iButtons...Each iButton has a unique ID number, which is detected by the time clock when the employee taps his or her button to it.

UPC: 022447294217
Item Condition: NEW

Returns Possible: YES
Returns Period (Days): 20

Manufacturer Warranty: 1 YEAR

Dimensions-
Length: 1.6
Width: 3.6
Height: 1.3