"Max Flow rate: 14 lm-1 with 1.2?m Filter Max Flow, free air: 19 lm-1 Dimensions: W 178 x H 117 x D 191 mm Modes: Elapsed Time Timed Run Delayed Start Supplied with free Battery Charger The 12000 has different modes of use to give great flexibility as well as the reliability you would expect. The Elapsed Timer will display the time that the pump has been running since the user began the test until the pump is stopped when the total run time will be displayed. A timed run allows the user to set the run time, in minutes. The pump will then run for the time specified and switch off. When the pump is next switched on the display will show that the sample has been completed and confirm the total run time. The Delayed Start function will allow a run time exactly as a timed run but the user can also set when the sample should start by specifying the date and time. At this date and time the pump will switch on, run for the number of minutes programmed by the user and then switch off. When the pump is next switched on the display will show that the sample has been completed and confirm the total run time. Settings for the Timed Run and Delayed Start modes, as well as the flow rate set, are stored so that every time the pump is switched on your �favourite� settings are ready to go, saving time on adjustments every time the pump is used. The flow rate is fully adjustable and is maintained by our flow control circuit which maintains the set flow rate to within �5% with a maximum continuous run time in excess of four hours. Can be used with the Quick-Release Mast, SP 014, if required"