Bluetooth 5.0 with MP3 function supports stereo music playback, phone calls.It supports all audio devices with bluetooth-compatible function, such as mobile phones, tablets, laptops, computers, etc.Featuring with 3.5mm audio jack, you can easily connect various devices without Bluetooth.It allows you to answer or reject calls anytime, anywhere.With large capacity battery and charging by USB design, it is convenient and practical.The charging time is 1 hour, the playback time is up to 10 hours, and the standby time is up to 250 hours.This is the best choice for listening to music, watching movies, online chatting, etc.With TF card socket and without any bluetooth-compatible device, you can still enjoy music anytime and anywhere.The foldable design and adjustable length earphone strap make it very comfortable and easy to carry.Item Name: bluetooth-compatible HeadsetBluetooth Version: V5.0Material: PlasticOutput Power: 40mWEffective Range: 10-30MSensitivity: -84dBm / 0.1%BERFrequency Response: 20 Hz-20 KHzSignal to Noise Ratio: 85dBDistortion: 1%Impedance: 32Speaker Size: 40mmBattery Capacity: 400mAh(Included)Music Time: 10-11 HoursStandby Time: 250 HoursCharging Time: 1-2 HoursOperating Temperature: -4~+131 Degree Fahrenheit(-20~+55 Degree Celsius)Interface: 3.5mm Audio Hole, TF Card Socket, USB2.0Features: Large Capacity Battery, with TF Card Socket, Cool Appearance, with MP3 FunctionSize: 19cm x 18cm x 7.5cm/7.48" x 7.09" x 2.95" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Headset1 x 3.5mm Audio Cable1 x USB Charging Cable1 x User Manual