<ul><li>kids wireless headphones adopts the bluetooth 5.0 version, you can use your own audio cable (3.5mm diameter). So it can be used as both a wired headset and a wireless headset, very convenient especially when out of power. The cable supports control from various devices like smartphones, tablet, kindle, PC,laptop, TV and music players</li><li>quick charging 2-2.5 hours, and last up to10 hours. Best tool for online study. Built-in microphone and can be used for video chat, answering the phone, online classes or streaming.</li><li>wireless headphones kids feature soft memory padding and silicone headband, stress-free long-term wear. These cat headphones are adjustable. Adjust the headband size to fit different-sized heads.Built-in volume limiter to prevent the sound from being too bright. 105dB volume limit prevents their delicate eardrums from potential hearing damage.</li><li>Bluetooth version：V5.0</li><li>Frequency range：2.4GHz-2.48GHz</li><li>Working Range：Around 10m (open space Max.20m)</li><li>Charging Voltage：5V 1A</li><li>Operating voltage：3.7V</li><li>Standby current：&lt;0.02mA</li><li>Music time： ≥7H</li><li>Talk Time：≥7H</li><li>Standby Time：&gt;148H</li><li>Charging time：&lt;2.5H</li><li>MIC：40dB±2dB</li><li>Speaker：Φ40mm/32Ω</li><li>Output power：&gt;10mW</li><li>Output Frequeney：20Hz-20KHz</li><li>Batter: Built-in lithium 400mA</li><li>Working Temperatuer：-10~+55℃</li><li>Packing list:</li><li>earphone * 1</li><li>Audio cable * 1</li><li>USB cable * 1</li><li>manual * 1</li></ul>