A paper towel roll dispenser for dispensing of a paper towel, comprising: a dispenser configured for dispensing of a paper towel; and a sensor in communication with an electrical circuit carried by said dispenser, characterised in that: said sensor is configured for detecting identification information about a paper towel when said electrical circuit is completed by a paper towel; and said dispenser has a support configured to rotatably support a roll of a paper towel and to receive a core of a paper towel, and wherein said electrical circuit has a pair of first contacts (2023,2024) for receiving a conductive element (2030;2040) on a core of a paper towel so as to complete said electrical circuit, wherein said support is a pair of arms (2006,2008) that are configured to extend into either end of a core of a paper towel, and wherein each of said arms (2006,2008) has one of said pair of first contacts (2023,2024) located thereon configured for engaging a metal coating on the inside of a core so as to complete said electrical circuit or wherein one of the arms has both said first contacts thereon having a space therebetween and which are closed when the core of the paper towel is received in aforesaid. a dispenser configured for dispensing of a paper towel; and a sensor in communication with an electrical circuit carried by said dispenser, characterised in that: said sensor is configured for detecting identification information about a paper towel when said electrical circuit is completed by a paper towel; and said dispenser has a support configured to rotatably support a roll of a paper towel and to receive a core of a paper towel, and wherein said electrical circuit has a pair of first contacts (2023,2024) for receiving a conductive element (2030;2040) on a core of a paper towel so as to complete said electrical circuit, wherein said support is a pair of arms (2006,2008) that are configured to extend into either end of a core of a paper towel, and wherein each of said arms (2006,2008) has one of said pair of first contacts (2023,2024) located thereon configured for engaging a metal coating on the inside of a core so as to complete said electrical circuit or wherein one of the arms has both said first contacts thereon having a space therebetween and which are closed when the core of the paper towel is received in aforesaid. said sensor is configured for detecting identification information about a paper towel when said electrical circuit is completed by a paper towel; and said dispenser has a support configured to rotatably support a roll of a paper towel and to receive a core of a paper towel, and wherein said electrical circuit has a pair of first contacts (2023,2024) for receiving a conductive element (2030;2040) on a core of a paper towel so as to complete said electrical circuit, wherein said support is a pair of arms (2006,2008) that are configured to extend into either end of a core of a paper towel, and wherein each of said arms (2006,2008) has one of said pair of first contacts (2023,2024) located thereon configured for engaging a metal coating on the inside of a core so as to complete said electrical circuit or wherein one of the arms has both said first contacts thereon having a space therebetween and which are closed when the core of the paper towel is received in aforesaid.