Mini USB portable FM radio compact stereo travel speaker music player with very portable design and exquisite workmanship. The size details is 4.84''*1.26''*2.64'' and the surface shell uses imported UV technology. * MP3 Music Player supports TF Card / USB Disk; a standard 3.5mm jack for earphones if necessary, easy to plug in your iPod, Smartphone, tablet, laptop and other MP3 player or any audio source that uses a standard 3.5 mm jack. It has a large LED Screen Display, which is easy to read and very useful. * FM Radio. Directly using number buttons to enter the channel that you want . Frequency from 88.0MHz to 108.0MHz,you can choose to your favorite channel with clear FM signal(displayed on the screen) to enjoy decent. *The children lock function makes it safer for children to play. Built-In power amplifier with excellent sound quality. Emergency Flashlight Function is very handy for you whenever you need a light. The standard rechargeable and replaceable 18650 1500 mAh Li-ion battery *Package Include: Rolton W405 FM Radio speaker x 1, Micro USB cable x 1, 18650 Li-ion battery (pre-placed in speaker) x 1, user manual x 1 (USB power adaptor NOT INCLUDED) Function & Parameters:  TF Card: Yes?6?7USB Disk: NoFM Radio:YesRecording: NoLoop play back: YesIncluding Wall Charger: No Basic function: Music/FM/Flashlight/Audio-In JackMaterial: ABS+UVOutput power: 3WInput Power: Power Adapter/USB/ Li-ionSensitivity: 83dbDistortion: 1%(3.7v,1Khz,1W)Working Voltage: DC 3.7VCharging voltage: DC 5.0V---500mALlithium Battery Capacity: 1500 mAHImpedance: 4 ohmDisplay: LEDSpeaker: 1.5 inch *1+ Passive Radiator*1Audio Format: MP3Firmware Upgrade: AvailableDimension: 123mm*32mm*67mm (W*D*H) Approx ( 4.84'' * 1.26''*2.66'') Operating Temperature: -5 --- 40 degrees Centigrade Net Weight: About 128g Package Content: 1* Radio speaker 1* User manual1* USB Cable1* 1500mAh replaceable Battery1* Strap