- These Goji headphones are limited to 85dB to protect your little one's hearing- Bluetooth connectivity means your kids can play and enjoy their tunes without getting tangled- The rechargable battery gives them up to 16 hours of playback on a single charge- If the battery runs low, the 3.5 mm jack lets them plug in and keep the music or stories going- Chatting with teachers and friends is easy using the built-in microphone- They can stay comfy while learning with the adjustable headband and soft cushioned ear pads