Add this hands-free solution for a fantastic favorite! The wireless Bluetooth speaker works with MP3, smartphones and other devices to create convenient cellphone calls, and play music from inside the high-quality steel casing. This great accessory includes a built-in subwoofer, works from a capacity lithium battery for four straight hours of playback, works as a headset and showcases your company trademark in an excellent location to meet their entertainment and your advertisement needs. Any dorm room, bedroom or office setting will be a little more fun with this sound system included. It's also available in various colors to match your company's colors. They'll speak well of your brand with this great giveaway! Features: - Standard 3.5mm Audio Input which support MP3, Mobile Phones, iPod, iPhone, etc. - Works as far as 10 meters from the Bluetooth device - Supports Talking / Listening even if the Device is Located in Another Room - With High Quality Steel Casing - Can Last Up to 4 Hours of Continuous Playback - Big Capacity Battery with 450 mAh - Shows Speaker's battery level on iPhones - Bluetooth Support for Hands Free Cell Phone Calls - Has Wonderful Built in Subwoofer speaker - High Capacity Lithium Battery - Also Works with Headset TECHNICAL INFO: - Charging Voltage: 5V - Operating Voltage: 3.7V - Output Power: 3 -5W - Frequency Response: 60Hz- 18KHz - Battery Capacity: 450 mAh