6.? Reliable NUOKER after-sales service ?--- If you encounter any problems during use, you can contact our after-sales customer service at any time, and the customer service will reply you within 12 hours and give you an optimal solution. 5.? Hand Printer For Any Surfaces ?--- This pocket mobile handheld inkjet printer prints on paper, cardboard, wood, textiles, leather, walls, cloth, stone, metal. Portable inkjet coder with compact slide design for better prinring on curved, uneven or smooth surfaces like glass, plastic, coffee mugs, ceramic pieces eggs or other materials. 4.? Endless Printing Possibilities ?--- The NUOKER mini handheld printer can print text, images, QR codes, barcode, Batch Series Number, logos, production date, expiration date. Supports multi-line print. Adjust the size and position of your prints and you can easily create different print combinations. Mini handheld inkjet printer is a perfect tool for the business work, daily paperwork, arts, crafts, DIY printing,industrial and personal use. 3.? Ink Cartridge Waterproof ? --- The NUOKER handheld printer only use quick-drying ink cartridge, Ink cartridge is not permanent, the waterproof performance of ink cartridges is determined by the printing material, If printed on absorbent materials, the waterproof effect will be very great, such as fabric, paper, wood, etc. If printed on non absorbent materials, the waterproof effect is weaker, and the drying time needs to be extended. The printed content can be removed with alcohol, such as metal, glass, ceramics, etc. (If have any questions, please contact service team,they will give you early reply within 12hours.). 2.? 42ml Quick-Drying Ink Cartridge ?--- This handheld inkjet printer comes standard with a black high-definition 42ml quick-drying ink cartridge, which prints clearly and has strong adhesion. The color of the ink cartridge determines the color of the printed content. The ink cartridge colors we can provide are black, white, red, yellow, blue. (Note: Please pay attention to the maintenance of the ink cartridge. When not in use, cover the protective cover in time to prevent the ink cartridge from drying out and blocking the nozzle.). 1.? Smallest Upgraded Inkjet Coding machine ?--- This Portable Mini handehld Inkjet Printer Weighs 0.55lb/0.25kg and is at a very small size of 3.94*1.85*2.87inch (100*47*73mm). The printing resolution is 600DPI, which fits well in your pocket. It's super easy to start your printing journey.