'Pebble' replaced existing function that fulfilled locking system for a car by putting the button by the easier behaviors. Many behaviors such as drawing an arc using the hands or stepping on something make some good function and additional unexpected effect by being applied to the products. 'Pebble' was constructed on up-down sliding system. You can push up on the upper part to unlock, and push down on it to lock. The shape and using figure are more stylish than existing products by the sliding system.