JBL Charging Case 600 Duo Pack

With the JBL Charging Case 600 Duo Pack, you won't be without music soon. You can use one battery for your speaker and the other one for your smartphone. You can use the battery with the JBL PartyBox 520 and Boombox 4. When you place the battery in the charging case, you can also use it as power bank. This means you can take it with you and charge your smartphone with it.