Features: Ring time: 3 seconds. Mechanical power: no battery, economical and practical. Timing range: 1 minute to 60 minutes can be adjusted arbitrarily，Simple operation, 2 steps to complete the setting(Important: 2 steps are required) Suitable for living room, bedroom, study room, office, kitchen, bathroom, public places. This useful design will not only help the adults but also children to understand how much for time is left, improving work and study efficiency. Specifications: Material: plastic Size: approx 6x6cm/2.4x2.4in Ring time: 3 seconds Note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Mechanical Timer Ring time: 3 seconds. Mechanical power: no battery, economical and practical. Timing range: 1 minute to 60 minutes can be adjusted arbitrarily，Simple operation, 2 steps to complete the setting(Important: 2 steps are required) Suitable for living room, bedroom, study room, office, kitchen, bathroom, public places. This useful design will not only help the adults but also children to understand how much for time is left, improving work and study efficiency.