"Our shakers are equipped with two hard rubber seals. One in the lid and a solid rubber seal in the closure at the mouthpiece." (see image 3)

"Yes, our battery shakers are washable and 100% leak-proof – both inside and out."

"Yes, our shakers are virtually silent with the lid closed."

"Yes, there is a self-cleaning function."

Simply add cold or hot water + soap (dish soap) to the shaker, close the lid, press the button, shake, and then rinse with clean water.

"Our long-term tests showed an average battery life of 50 minutes. This gave us approximately 55 to 70 shakes per charge."