NAVISKAUTO Smart IR wireless headphone is lightweight, have soft ear pads and head-protector, an adjustable headband so your child can listen with comfort. Don't forget that it also has a 3.5mm jack which means it can compatible with most smartphones, DVD/CD MP3 player, tablets and laptop computers Easy for Wireless-use Just turn on your IR sender device to A channel/B channel,then turn on the power of the headphone(AAA battery needed),switch to the same channel to receive the audio stream from your IR sender device.Or you can directly use the 3.5mm socket for audio transfer from other device.(Note:In this mode,volume knob on headphone will not be active,you can only adjust via your device.) Technical Specification Channel: Dual Carrier frequency: a) A channel: 2.8MHz for right channel; 2.3MHz for left channel b) B channel: 3.8MHz for right channel; 3.2MHz for left channel Mode: stereo S/N ratio: 70dB Distortion: Frequency response: 20 - 20,000Hz Impedance:32 Ohms Sensitivity: -88dBm3dB Battery Requirement: 2*AAA 1.5V battery Effective Range: Max to 10M without block Mini 3.5mm jack for audio input from other devices Package list 1*IR headphone 1*1.5M 3.5mm Audio cable 1*User manual