Top features:- Long-lasting 6-hour battery life for portable listening - Listen to your your smartphone music collection through the speaker - Add an additional speaker using Bluetooth for powerful stereo sound - Water resistant to accidental water splashes - Make hands-free calls using the speaker Long-lasting 6-hour battery lifeA rechargeable battery offers a generous six hours' worth of portable listening on a single charge - enough to enjoy your music wirelessly for most of the day.Listen to your smartphone music collectionBluetooth technology lets you pair your Bluetooth compatible smartphone or tablet with the Jam Double Down Wireless Bluetooth Speaker. Enjoy any music stored on your mobile device out loud and in better sound quality.Add an additional speakerPair two Double Down speakers together using Bluetooth for more powerful wireless stereo sound. It's an ideal feature for larger rooms or outdoor garden parties.Water resistantShould your speaker get caught in light rain, the Double Down is rated IPX4 as being water resistant to splashes of water for at least five minutes, giving you time to bring them back inside before any torrential downpour.Make hands-free callsConnecting your smartphone means you can use the speaker as a speakerphone without the need to disconnect entirely from your music. Your tunes will carry on playing once you're done talking.