Superior Sound. This headset is designed to deliver the perfect personal listening experience with high-output sound, excellent frequency response and wide dynamic range, all while creating an environment that naturally blocks out most ambient noise. Built-In Volume Limiter The Kid-Safe headphone series features a built-in volume limiter, which protects children's hearing by automatically limiting audio volume to approximately 80 percent of the original maximum volume. These headphones are safe to use for children from 3+ years old. 6 in 1 multifunctionality You can use this headset to connect to your PC computer, tablets, notebook, mobile phone, MP3/MP4 player and any other Audio/Video device through the 3.5mm cable. Also you can use it to connect to any Bluetooth enabled device. Insert a MicroSD card into the headset, so you can enjoy the music really lightheartedly. It also buit-in FM Radio function. Built-in Microphone so you can use it to answer phone calls wirelessly hands-free when your cellphone is in your bag, pouch or on the far away desk. Built-in Colour LED lights. Your children will love to have beautiful Colour lights when using the headphone. Specifications: Bluetooth Specification: 3.0+EDR Operating Range: 30ft Sensibility: 85 3dB Frequency response: 24-24KHz Compatible Bluetooth profiles: A2DP, AVRCP, HSP, HFP RF Frequency: 2.4G Battery Capacity: Li 500mAh Standby Time: about 150 hours Charging Time: about 2 hours Battery PlayTime: 8-10 Hours by one time full charge TF card Player: Max support 16 GB Microphone: yes What's in the Box: 1 x Bluetooth Headphone 1 x 3.5mm Jack Cable 1 x USB Charging Cable 1 x User Manual