Waterproof and chargeable electric beverage frothers for use in adding creamy foam to beer and cocktails; Waterproof and chargeable electric beverage frothers for attachment to a stainless steel tumbler for use in adding creamy foam to beer and cocktails, sold separately from the tumbler; Electric cocktail frothers; Electric beer frothers; Beverage processing machines; and parts and fittings for all the aforesaid goods