Waterproof: IP67 (Among the protection levels defined by the International Electrotechnical Commission (IEC), dustproof performance of level 6 and waterproof performance of level 7) Bluetooth compatible, long battery life of 24 hours of continuous playback. A detachable cable can be used when the battery runs out or to share music with up to 4 friends. The maximum volume can be set in three stages. Equipped with four listening modes, you can select the optimal listening mode depending on the age and environment of the children. You can select the listening mode by pressing and holding both volume buttons simultaneously. (-75 dB for toddler mode, -85 dB for kids mode, -94 dB for travel mode (optimal for use on airplanes), -94 dB for study mode) WAVE is very durable and can be adjusted to a sufficient size. The headband is made of specially adjusted polypropylene, so it won't break even if you bend or pull it. The material is PVC and phthalate-free, and exhibits flexibility. In addition, the ear cushions and headband use hypoallergenic materials that can be used even by people with sensitive scalps and skin. 1-year warranty for domestic genuine products. BuddyPhones WAVE is a top-of-the-line model and the world's first kids' headphones that combine both waterproof and wireless features. The waterproof BuddyPhones WAVE is durable and can withstand splashes, accidental spills, and being left out in the rain, making it perfect for taking to the beach or pool. The WAVE has an 18-hour battery life and comes with a detachable backup buddy cable, which can be used when the battery runs out or to share with friends. The WAVE has four listening modes to suit a variety of needs - toddler mode, kids mode, travel mode, and study mode, with unique settings that optimize vocals.