Volume Maximum volume 75dBA, calibrated to protect hearing when listening close. Extendable to 90dBA under adult supervision. In My Account, the section of the site reserved for customers, an update is available that allows you to unlock the Ocarina volume permanently. Battery Lithium ion battery (3.7V). Playtime up to 15 hours. Charging time: max 3.5 hours. Rechargeable via micro USB socket. 1.4″ screen display with blue LED backlighting. Internal memory 4GB. It can contain over 800 tracks and up to 100 minutes of recordings (10 recordings of 10 minutes each, in .wav format). Like a normal external memory, the tracks can be managed from a computer using the supplied cable. Certified materials Double structure with internal material in high resistance and external covering in anti-shock rubber certified for food use. (FDA Certification, Food and Drugs Administration – USA). Rec Built-in microphone, allows you to make recordings at any time (just hold down the Goose key for 3 seconds). Shockproof structure The rubber coating protects the electronic board. Compatibility Mac, Windows and Linux compatible. It supports all major audio formats: MP3, WAV, OGG and many M4A extensions. Connectivity Micro USB socket. 3.5mm audio out. Ocarina can be listened to with headphones, plugged into your home or car stereo. Packaging Each package includes: Ocarina player USB-micro USB cable (orange) Quick user guide in 5 languages ( it | fr | en | de | es ) Menu of pre-loaded tracks Warranty and Assistance 2 year warranty on defects manufacturing.