4 LED lights indicate battery status, Input: 5V/1A, Output: 5V/1A. Aluminum Exterior, Micro to regular USB cord include, UL certified Lithium-Polymer battery. Complies with Prop 65, UL, UN38.3. 3.75" L x 2.5" W x 0.25" H. Price includes a Laser Engraved Logo. Imprint area is 1.75" W x 2.625" H on Either Side. Call for multi-colour or multi-location imprints or for rush delivery availability.