HIGH-FIDELITY & POWERFUL - 2x5W quality acoustic drivers, passive vibration, aptX Lossless and Bluetooth 3.0 technology combine to deliver full, natural sound, strong enough to fill up a large living room without distortion VERSATILE MODES - Switch between Wireless Bluetooth,FM Radio, Micro SD card, USB flash drive and AUX-in. FM Radio auto presetting and last station memory help access to your favorite stations quickly despite lack of LED display LASTING BATTERY LIFE - Built-in 2200mAh rechargeable lithium battery for up to 8-10 hours of playtime.You never worry about recharging when powered with USB adapter SIMPLE & PORTABLE - Easy to set up and connect wirelessly, and you can also play from USB flash drive/Micro SD card. A pleasant size to carry everywhere with one hand UNIQUE UPGRADED VERSION - Last volume memory-the radio will not start from loud noice; voice prompts are replaced with a soft tone when Bluetooth is connected; max volume reminder is added