parameter: Material: Blade: Stainless Steel Handle: aluminum alloy Blade: plastic Steps for usage: 1. Install the cutter head on the handle 2. Adjust the handle length as needed: 3. Gently place the bottom of the cutter head close to the back, slowly pull the cutter head up and down, and start shaving the back hair (do not press the cutter head too hard to avoid scratching the skin) 4. After use, clean the cutter head with water or a towel and dry the water stains on the cutter head Kind tips: 1. The sharpness of the blade is high, so be careful when using it. Do not touch the blade directly with your fingers, and do not press the blade too hard to avoid scratching the skin 2. After using the product, please wipe off the water stains on the cutter head and store it in a dry environment 3. Do not give the product to children to play with 4. The use time is long. If you find that the cutter head is not sharp enough, it is recommended that you buy a replacement cutter head packing list: 1. Blade 1 2. Handle 1 3. Manual 1 4, 3 blades Product size: 125*290*45mm Product weight (g): 105g (single blade 20g) Packing size (mm): 306*62*45mm Weight with packaging (g): 215g