SoundBot&reg; for Kids SB272 Volume-IQ Technology 85dB Safe for Kids Bluetooth V4.1 Headphone Wireless Headset for Music Streaming & Hands Free Calling for 12Hrs Talk Time, 250Hrs Standby Time (GREY) Smart Volume-IQ Intelligent Technology limits the maximum audio volume to 85dB ~ 90dB to protect kid's hearing at safety level Fits for 3+ years kids. Feather-weight (2.9oz) and flex headband design with adjustable hidden arm mechanism provides maximum comfort, mobility, and flexibility up to 7.5 inches in height. High-performance long lasting battery performance for up to 11 hours of music playback time via wireless streaming and 250 hours of standby time from 33 feet away with free line of sight. Universal compatible Bluetooth v4.1+EDR supports Bluetooth A2DP, AVRCP, HS/HF profiles, and backward compatible to Bluetooth 1.0, 2.0, 3.0, and 4.0. Pairs with all A2DP-enabled devices including smartphones, tablets, iPhone, iPad, Samsung Galaxy, laptops, PC, digital media players, etc Features vibrant color, sleek, fashionable, and stylish light weight one button design with echo/noise reduction ear-cup to screen out noise level. Comes with built-in microphone for hands-free calling and MicroUSB charging port. (MicroUSB Cable included)