To fill the unit with citronella, put the device on a flat surface with filling valve upright. Hold refill canister upside down. Insert nozzle into refill valve, apply pressure until device is properly filled (25 seconds). This should give your device 25 strong sprays (illustration A). Be sure to support device with one hand while holding can with the other hand. Insert the battery into device above battery pull tab. Be sure to install battery with proper polarity. Place collar on the device (illustration B). Place spray collar on dog making sure the spraying valve spray upwards. Adjust collar to correct fit, secure but not tight (illustration C). Remove battery when not in use.