• MATERIAL QR CODE. Say goodbye to the hassle of finding the optimal processing parameters. It only takes two steps: place the QR code sticker/card into the machine, then click the "Refresh background" button and immediately apply the optimal processing parameters. You can click here to learn how to use automatic QR code recognition with the P series or F series. (*Please note that the automatic scanning function requires a camera. Non-camera machines (F1/S/M1U/D) can manually scan the QR code to quickly obtain the optimal processing parameters.)
• 4 colors per pack: black, white, wine red, deep grey.
• Silicone watch bands, breathable and comfortable fit, best apple watch bands for working out.
• Fits wrists: S/M for 140mm-190mm, M/L for 165mm-210mm.
• Designer apple watch bands. Laser-engraved rainbow filling, no extra coloring required, fade-proof.
• Please refer to the "compatibility" section for engraving specifications of each apple watch band.
• Due to long-term friction, the watch band may fade. To maintain the appearance of the watch band, please minimize friction, clean the sweat or dirt on the surface of the strap regularly, avoid prolonged exposure to sunlight and high temperatures, and avoid using strong cleaning agents or chemicals to prevent damage to the strap.

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