A hands-free towel dispenser for dispensing a measured sheet from a roll of towel material includes a housing having an internal volume so as to retain at least one roll of towel material therein. An electronically powered dispensing mechanism is contained within the housing for dispensing a measured sheet from the roll of towel material upon actuation of the dispensing mechanism. A passive trigger sensor is disposed so as to detect the presence of a user in a first detection zone, and an active dispense sensor is disposed so as to detect the presence of a user in a second detection zone that is different from the first detection zone. For each dispense cycle, the passive trigger sensor senses the presence of a user in the first detection zone prior to the active dispense sensor being enabled to initiate a dispense sequence upon detection of the user in the second detection zone.