Professional Digital Auto Glue Dispenser LY 983A Glue Dropper Solder Paste Liquid Controller Fluid Dispenser Tools Machine. Features: Manual or timer operation modes Foot pedal controlled Suck-back feature ensure no dripping Designed for wide range of application as EFD, I&J Fisnar Complete with an accessory dispensing kit Timer mode dispensing time 0.01-99.99 seconds Timer mode cycle time 0.1-9.9 seconds Manual mode, materials could be dispensed continuously until operator release the foot pedal This unit need to be connected to air compressor (1.5HP or above)