LG G WATCH Quick Start Manual page 20

Avoid exposing the product to environments with excessive dusts
or moisture. Do not use the product in the following environments.
Do not immerse the product in any liquid chemicals (soap,
SOAP
etc.) other than water.
Do not immerse the product in salt water, such as sea
SALT
water.
Do not immerse the product in hot spring.
Do not swim wearing this product.
Do not use the product underwater.
Do not place the product directly on sand (such as at a
beach) or mud.
18 LG-W100