Metal Body: The lock body is made of metal, with sharp edges and smooth surfaces, an upgraded textured metal lock. Durable and secure. 99 Hours: The maximum duration is 99 hours and 59 minutes. Lock it when you have set it and started it, when the time is up it will unlock and open automatically. Please set the time reasonably. Easy to Use: Small LCD screen with backlight, displays unlocking time smoothly and clearly, 3 small buttons to adjust hours or minutes, easy to use. Wide Use: The metal padlock can lock addictive items, such as mobile phones, cigarettes, snacks, drinks, which is perfect for kitchen, school, gym, etc. With a compact size, it is light and suitable for airport and travel. You can lock your important items at any time to protect your privacy. Improved Sleep Quality: Reduce the time you spend looking at your mobile phone, fall asleep early, improve sleep quality, strengthen immunity and live a good life, control smoking: limit smoking, reduce the number of cigarettes per day, gradually extend the duration of sleep. intervals and cultivate good lifestyle habits