Customer Questions & Answers Question: Why is the battery not charging? Answer: Please peel off the insulative protecting film on the battery at first use. Question: How to use built-in FM radio? Answer: Please plug in the USB cable as an external antenna when you want to listen to the radio. Question: How to switch the language of voice prompt? Answer: Long press M button for over 3 seconds to switch the language.Highlights:> Supports wireless & streaming audio via Bluetooth V3.0 technology.> With digital display, light sense touch buttons and NFC function.> Supports U disk and TF card ( Max 32GB, not included in the box), plays MP3 format music, with memory function.> With FM radio, can automatically search and store channels.> Tumbler design more protective more safe and funny design.> 3.5mm audio output / input, works great with computer, MP3 / MP4 / mobile.> You can select a song forward and reverse. Specifications:Model: KR-8800 Compatible with: iPhone, iPod, Laptop, Mobile phone, MP3, MP4, MP5, PC, Tablet PC, TF/Micro SD Card Supports: Bluetooth, FM, LCD Screen, LED Shinning, Loudspeaker, NFC, TF Card Music Playing, Volume Control Functions: AUX Function, Songs Track, Stereo Connection: Wireless Interface: 3.5mm Audio, Micro USB, Power Charge Port, TF Card Slot, USB2.0 Audio Source: Bluetooth Enabled Devices, Electronic Products with 3.5mm Plug, Electronic Products with USB port, TF/Micro SD Card, U-disk Material: Plastic Color: Black, Blue, Green, Red, White, YellowBluetooth Version: V3.0 Audio File Format: MP3 Transmission Distance: Up to 10m Speaker Impedance: 4 Power Output: 2 x 3W Freq: 40-20kHZ S/N: 85dB FM Radio Frequency: 87.6-108MHz Charging Voltage: DC 5V / 1A Charging Time: 5-6 hours Lasting Time: 4-5 hours Battery Capacity: 1200mAh Dimensions (L x W x H): 23cm x 6.5cm x 6.5cm / 9.06 x 2.56 x 2.56 Weight: 0.678kg / 1.49lbWhat s in the box:1 x Zinsoko KR-8800 Portable Bluetooth Speaker Wireless & Streaming Audio Outdoor Speaker with LCD Screen and FM Radio, NFC Enabled1 x Audio Cable1 x USB Cable1 x Rechargeable Battery1 x English User Manual