Two low-profile 5-watt speakers with passive radiators deliver a premium sound experience with punchy bass & dynamic frequency response range of 80Hz-20kHz Bluetooth 5.0 wireless pairing technology KoolSync pairing technology easily allows you to sync the Bluetooth speakers of two KoolTunes coolers for a better surround sound experience; not backward compatible, both units must feature KoolSync technology to enable this feature IP56-rated water- & dust-resistant design Up to 10 hours of audio playtime on a single charge