The K9 is Martin System®'s Bluetooth transmitter for the Chameleon® III B — a compact remote with a colour backlit screen giving reliable, discreet control at up to 1,000 metres. Connected through the free DOGGIFY app, it lets you fine-tune and alternate stimulation to each dog's exact requirements and switch modes at a glance. Pairs with the Chameleon® III B collar (sold separately). Remote control only. SAFETY INFO An e-collar is a fantastic tool when used and conditioned correctly. An e-collar should always be introduced positively! Applying an e-collar to a dog without conditioning or teaching the dog what the stimulus means and how to switch it off is unethical — this tool will not magically fix your dog's behaviour. If you have never used an e-collar before, please read the strongly recommended advice below: Only use an e-collar with advice from a professional trainer We recommend purchasing Larry Krohn's E-collar training book in combination with this product.