Or if you don't want to deal with charging another device get a passive sound amplifier/speaker for your phone. I have one sitting in my bathroom for shower music and I can hear it just fine over the sound of the shower. https://www.amazon.com/GUMMI-Silicone-Phone-Speaker-Amplifier/dp/B01H53V5Z8/ref=sr_1_10?ie=UTF8&qid=1506523086&sr=8-10&keywords=phone+powerless+speaker