The Xoopar® Ring Series 2500mAh mobile power bank has a wireless speaker (up to 30ft) to play your tunes for up to 16 hours. It also has a charging indicator light, carabiner clip and includes a micro USB cable to charge the power bank. Power bank output is rated at 5V/1A. Speaker output is 3w and the power bank charges in about four hours. This product has undergone the most rigorous testing in the industry and is SGS Q Mark certified. Dimensions: 1.25" x 1.25" x 5.25"