Portable Wireless Bluetooth Stereo SD Card FM Speaker For Smartphone Tablet Laptop Feature: new and high quality Bluetooth specification:V3.0+EDR Frequency Response 150-1800HZ Output power 3W THD 10% FM frequency range 87.5-108mhz Built-in rechargeable battery 5V/400mA SNR 90DB Speaker 1.58inches(external diameter 40mm)40hm*2 Bluetooth connection distance 25M the hands -free function Multi-fuction: support bluetooth/ USB/ SD Card /FM Colors:,Blue,Red,Green Model size110x38x53mm Method of use: Open the Bluetooth mobile phone or computer Search Bluetooth headset signal, in accordance with the instructions of the link Other detailed functional use, please debug instructions Package Content: 1 X Bluetooth Speaker 1 X USB Charging Cable