The Cardo Spirit HD Duo helmet intercom offers a 2-way BT intercom for two riders at a range of 600m / 0.4mi. It features 40 mm HD speakers and an advanced processor for immersive sound with wideband voice. 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 wanted 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 a touch of a finger or the sound of your voice. It is fast charging with 13 hours talk time with 2 hours charging and 2 hours talk time with a 20-minute charge and standby of 10 hours. The dimensions measure: central unit: Height: 47mm, Length: 78mm, Depth: 19mm, Weight: 35g and speakers diameter: 40mm with depth: 10mm. The box contains 1 x Cardo Spirit HD communication device, 2 x Cardo speaker pair, 2 x Cardo microphone, 2 x Cardo gooseneck microphone and including Velcro pads.