Time of 15 minutes: The product has 15 minutes, which is a common time to enjoy a sauna. Approximate 5 and 10 minute markers are also included for your shorter needs. Rotary Clock: This wooden hourglass is very easy to mount on the wall with 2 screws (not included), align the strips of wooden mounting fixed vertically, screw into the pre-drilled holes and hide the mounting strips perfectly behind the hourglass. WIDE USE: This hourglass is designed to withstand the heat and steam of a sauna. It can also be used for other purposes such as classrooms, yoga or fitness studios, or any other timed use. Specification: Condition: 100% new Material: wood, glass Duration: 15 minutes Scope of application: sauna Dimensions: as in the picture Package included: sauna hourglass Note: Due to manual measurement, please allow 0 to 1 error, please understand. Monitors are not calibrated same. the same way and project colors appear