Kids Wireless Bluetooth 4.2 Headphones, GranVela X2 Lightweight Retro Foldable Multifunction Headphones with FM Radio, TF Card Mp3 Player and Microphone (Grey) HIGH QUALITY SOUND/VOLUME LIMITED: High Precision 40mm Magnetic Neodymium Driver, delivers clear sound and deep bass. Safe volume limiting, set at 93db max for children when listening by bluetooth or TF card. Volume limited to 108dB max for adults by wired function.Powerful Bass, Clear Treble and Balanced Sound. Suitable for every genre of music. Verified by thousands of customers. PREMIUM BATTERY PERFORMANCE: Up to 6-8 hours of play time with rechargeable lithium-ion battery and 240-hour standby time. 2-3 hour standard charge time, with convenient 3 minute fast charging which allows you up to 1 hour play time 5 IN 1 FUNCTION: Bluetooth Audio/ Micro SD Player/ FM Radio/ Bluetooth Talk/ AUX with 3.5mm cable/ Instant Music Sharing with 3.5mm cables EXTREMLY COMFORTABLE: crafted of synthetic leather the plush earmuffs are designed for extended wear. Suitable for sports and outdoor activities IN PACKAGES: X2 Headphone, USB Cable, 3.5mm AUX Cable, User Manual and 12-month manufacturer's warranty