Yakult Toughman Mountain Bike Alarm Clock. The clock works when you insert 4 AA batteries. When the alarm goes off, it moves its head up and down while pedaling the bicycle to make a sound. Clock and alarm operation have been confirmed. This item is from several decades ago, and this is the first time batteries have been inserted to make it work, so we cannot guarantee the accuracy of the clock or alarm. Please be aware of this. Batteries are not included. The box has dirt and scratches, but the clock inside is in relatively clean condition. Thank you.