From Manufacturer
This white colored set of two Woojer Extreme Wearable Woofers are designed to attach to your belt with the included belt clip and the front of the chest using the included chest magnet. The matchbox-sized devices connect to one another and your portable music player using the included 3.5mm audio cables. Once connected, an on/off switch and a three-level intensity switch allows you to activate the vibration and set the intensity level. The wearable woofers reinforce low-frequency mid and bass frequencies by conducting vibrations into your body to make your music, movies, and games more convincing and compelling. They are also appropriate for enhancing the listening experience of hard of hearing people.
The woofers come with two chest magnets, two audio cables, a wall charger with two USB outlets, and two USB charging cables for recharging the devices. An optional iOS app can be downloaded from the web that provides a bass-boosting digital equalizer for sending more signal to the devices. An optional sports-strap for more active use as well as a hard carrying case are available (sold separately).