How waterproof is Samsung's gear fit2 pro bracelet? Is it easy to fall off when swimming?

Samsung Gear Fit has dustproof and waterproof function (IP67), which makes it easier to wear. * IP67 dustproof and waterproof: This equipment has IP67 dustproof and waterproof function defined by IEC60529 international standard. Please note that this mobile phone is not designed for surface or underwater operation, and it is only dustproof and waterproof in the specific environment required by IP67 protection level. Please use it in strict accordance with the instructions on dustproof and waterproof in this equipment manual, otherwise the user will be responsible for the equipment damage caused by it.