Don't let a depleted battery on your smartphone slow down your day. Consider handing out the Epsilon mobile power bank at your next giveaway event for branding that works! The 0.38" x 4.5" x 2.69" power bank is designed with a lightweight aluminum casing and has 4000mAh of backup power to charge smartphones, tablets, eReaders, and other electronic devices. It comes with a micro USB cable to charge the power bank. Customize the device your company, organization, school, or group's name, logo, and/or organizational message. Get more out your marketing with this promotional product! Ground shipment only.