The 'Tool Plus' unit is used to identify the powered on state of its associated power tool. The 'Tool Plus' is physically clamped to the power cord of the power tool. The method of detecting the status of the power tool is by means of sensing the magnetic field around the power cord when the power tool is turned on or off. The 'Tool Plus' is powered by +5VDC. This power is obtained from either a UL FCC approved AC to DC 5volt USB adaptor, or an associated 'iVAC Pro System' unit. If a 'Tool Plus' unit is in the Auto Mode when the associated power tool is powered on, the 'Tool Plus' unit will transmit an instruction, by means of a digital wireless signal, to the 'iVAC Pro Switch' instructing it to turn on and apply power to the Dust Collector. When the power tool has been turned off, the 'Tool Plus' units will transmit an instruction to the 'iVAC Pro Switch' telling it to turn off. The range for radio communications between the 'Tool Plus' and the 'iVAC Pro Switch' is forty feet. Active current sense level is adjustable from approximately 0.3Amps or greater. Range, forty feet. Ambient operating temperature range, 0 - 30C Powered from a UL FCC approved AC to 5VDC Adaptor. Regulatory Compliance: FCC ID: YCH- IVACTP. IC: 8940A-IVACTP 5Volt 1Amp AC to DC Adaptor. UL and FCC approved.