You don’t have to make due with your smartphone or notebook’s wimpy speakers in the hotel room. Just bust out DBEST’s London Duos, which pump out loud and clean audio via without weighing down your carry-on. Just connect to the main speaker via Bluetooth and it will transmit audio to the second unit via an audio cable. The best part is the 22 hours of battery life we saw in our testing. The two speakers magnetically attach to one another for easy travel, and they come with a travel pouch.