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The string "nylonup-petra-doccia01-036" appears to be a specific product SKU or identification code, likely for a or a similar pet accessory under the Nylonup line .
While the brake button is depressed, push the smaller lock switch forward to secure the leash at a fixed length. nylonup-petra-doccia01-036
Never touch the nylon tape or cord while it is moving, as it can cause friction burns or cuts. nylonup-petra-doccia01-036
If the leash gets wet, fully extend the tape and lock it in place until it is completely dry before letting it retract. nylonup-petra-doccia01-036
If your specific model includes a light, check for a rechargeable port or battery compartment on the handle.