Description:Operation of this timer is very simple, rotate clockwise to 55, then counterclockwise for the desired number of minutes and the bell will ring at the predetermined time.A mechanical timer, this timer is very interesting as it does not require batteries to operate.It is made of high quality plastic material.There are 4 different sizes for you to choose.This product is suitable for desktop, office, home, etc.Item Name: TimerMaterial: PlasticFeature: Creative, Machinery, Three-dimensionalSize Details: Style A: 11cm x 9cm x 6.5cm/4.33" x 3.54" x 2.56" (Approx.) Style B: 9cm x 9.5cm x 6.5cm/3.54" x 3.74" x 2.56" (Approx.) Style C: 10cm x 7.9cm x 7.8cm/3.94" x 3.11" x 3.07" (Approx.) Style D: 10cm x 8cm x 8cm/3.94" x 3.15" x 3.15" (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