13• 2.4 GHz device cautionsThe operating frequency band of this Wi-Fi device isused by home electrical appliances such as microwaveovens, as well as industrial, scientific and medicalequipment including private radio stations on factorypremises for identifying mobile units used inmanufacturing lines (radio stations requiring a licence),specified low power radio stations (radio stationsrequiring no licence), and amateur radio stations (radiostations requiring a licence).1 Before using the device, confirm that private radiostations for identifying mobile units, specified lowpower radio stations and amateur radio stations arenot being operated nearby.2 If the device causes harmful radio interference toprivate radio stations for identifying mobile units,immediately change the frequency band or stop use,and contact a Call Center on the Warranty Guide.3 If the device causes radio interference to low powerradio stations or amateur radio stations, contact aCall Center on the Warranty Guide.Waterproof / DustproofFunctionThis product is waterproof to IPX5 / IPX7 and dustproofto IP5X standards if the microUSB connector cap isclosed as well as the back cover is securely attached.- IPX5: means that this product continues to function asa phone after being sprayed from all directions with12.5 liters of water per minute from a 6.3 mm diameternozzle for at least 3 minutes, from a distance of approx.3 meters.- IPX7: The product retains phone functionality afterslowly immersing in still, room-temperature tap water toa depth of 1 meter and leaving it there for 30 minutesbefore bringing it out of the water.- IP5X: The product can be operated and the safety canbe kept after keeping the product inside of theequipment including dust with a diameter of less than75μm for 8 hours.• You can talk without an umbrella in the rain (approx.20 mm of rain in an hour).• Do not attach / remove the back cover or do not open /close the microUSB connector cap when your handsare wet or when this product has water drops on it.• You can rinse the product by immersing and slowlymoving in tap water of room temperature filled in abowl, or rinse it with hands under light running waterfrom the faucet.- Rinse the product with the back cover securelyattached while covering the external connectorterminal cap to prevent it from opening.- Do not use a brush, sponge, soap, or detergent forwashing.- Do not apply running water directly to the mouthpieceor earpiece / speaker.- Do not immerse or drop in pool water or sea water.Things to keep in mind• Before use, ensure that you securely close themicroUSB connector cap and back cover so that theyare completely attached. If any fine dirt (fine fibers,hairs, or sands) is between the cap / cover and theproduct, water could enter the inside of the product.• Do not use the product (operate keys, etc.) underwater.• Do not spray or immerse the product in liquids otherthan water of room temperature, such as soap /detergent / bath powder, sea water, pool, hot spring,sand / mud.