Special Detachable Design --- Compared with the window restrictor on the market, the window restrictor has no key, so there is no worry about the key being lost and unable to open the window. Special detachable design makes it easy to change the window position to fix the window at a small distance. No Baby Falling --- Helps to fix the window and meet the ventilation demand. The maximum distance of the window opening is 7cm, it is much smaller than the distance that babies will fall from the window. The window lock can withstand 27kg of thrust, and 30kg of tension, no worry about the window being closed by strong wind. the window or scare babies. Aging Resistance: Install the window restrictor with 3M VHB adhesive, no need for drilling or tools. 3M VHB adhesive with strong viscosity (the effect will be better after 72 hours). and can be removed easily without any residue, safe for the window. 3M VHH tape resistance from -30 to 90 without worrying about the summer heat and winter cold. Waterproof and wide range of applications: PC and ABS material makes it stronger and brings a longer service life. Waterproof material and adhesive tape let you have no worry about rainy days. The window restrictor can be used on the casement window and the hinged window. Number of products: 1 piece Color: dark gray Size: lock: 8.5 x 3.5 cm. Long strip: 20 * 3.5 * 1.5 cm