Your phone is your lifeline: now you can watch its heart beat. This unique, eye-catching black 5,000 mAh power bank breathes - essentially has a heartbeat - as it charges your device. UL lithium-ion polymer battery. Input: 5V/ 2A; output: 5V/ 1A, 5V/ 2A. Measures 4 7/8" x 2 3/4" x 7/16". Screened logo.