Make a solid addition to your promotional packages with this Rock On (TM) Stone Rechargeable Power Bank! It features a totally unique and attention-getting design with its organic stone shape, look and feel. It's great for use at home, at the office, or even while traveling. Having a backup power supply for cell phones and other electronic devices is essential when you're always on the go. Enlist the help of this powerful 4400 mAh power bank to make sure that you're able to handle even your longest days!