The ergonomic headband fits comfortably on every child's head as it is fully adjustable and can be used comfortably by your growing child. Built-in speaker drivers deliver fully balanced sound. Soft ear pads provide a comfortable and secure fit. The ear shells have soft foam cushions for superior comfort and safety. Maximum volume limited to 85 dB for safe listening through wireless device. The device can go from 8 - 13hrs of playtime. Features Bluetooth Version: V5, AB Working Distance: 10m Frequency Range: 20Hz - 20kHz Impedance: 32Ohm Battery : 400mAh Sensitivity: 85dB Driver Size: 40mm Charging Time: 2 Hours Charging Input: 5V DC, 0.5A Charging Port: Micro USB Play Time: 8 - 13 hours Specifications Product Dimensions: 15.5 x 6.5 x 17 cm Package Dimensions: 21 x 8 x 29.5 cm Weight: 0.5KG Recommended Age: Suitable for 3 years and above This toy is not suitable for ages under 3 years: It contains one or more of the following items marbles; small ball; or small parts. Recommended Age: Suitable for 3 years & Up