What this study timer can offer you is that it has a lanyard hole on the back, allowing it to be attached to a lanyard and placed wherever you can easily view it. It is this study timer features that can ring loudly to let you know when it's time to study or when food is ready, making your time more organized. It is made of ABS and LED, which is durable for long term use. The length of the product is 4.3cm, the width is 4.3cm, and the height is 1.5cm. This product is perfectly suitable for home, household, dorm, study, etc. Item Name: Timer Material: ABS,LED Battery: 1 x LR44 Batteries(Included) Features: Time Management, Simple Operation, Loud Voice Size Details: 4.3cm x 4.3cm x 1.5cm/1.69" x 1.69" x 0.59" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Timer