The Cardo Freecom 4X Duo helmet intercom offers communication for up to four riders with premium sound at a range of 1.2km / 0.75 mi. It features 40 JBL mm speakers with JBL sound profiles. It is fully waterproof to keep you connected in all climates and conditions with a two-year warranty. Over-the-air software Updates keep your unit updated via the Cardo Connect App. Universal connectivity connects the Spirit with any other Bluetooth headset of any brand, so the connection is easy and painless. Cardo's Automatic Volume automatically adjusts your sound volume based on the outside ambient noise. All the music you ever want is streamed directly from your smartphone, or you have the option of an FM radio with six preset station memory. So control, share and experience your favourite tune on the road. A robust and universal USB type C connector gives easy connections to any device. So make calls and control your GPS with the touch of a finger or the sound of your voice. It is fast charging with 13 hours of talk time with 2 hours of charging and 2 hours of talk time with a 20-minute charge and standby of 10 hours. The dimensions measure: central unit: Height: 48mm, Length: 78mm, Depth: 20mm, Weight: 37g and speakers diameter: 40mm with depth: 10mm. The box contains 2 x Cardo Freecom 4x communication devices, 2 x Cardo speaker pair, 2 x Cardomicrophonese and 2 x Cardo gooseneck microphones, including Velcro pads.