Sena is a company that manufactures products that allow riders to have hassle free communications between themselves and their passengers or other riders. The Sena SPH10 is very similar to the new SMH10, boasting some of the same features; but the SPH10 has been designed specifically for outdoor sports and activities. . The SPH10 is a Bluetooth V3.0 stereo headset with a long range Bluetooth intercom. It will allow you to not only make hands free calls with its Bluetooth mobile phone capability, but listen to music from your MP3 player (with music playback controls: pause, play, etc.), and hear voice instructions from GPS navigation systems. Each function is simple to operate with the easy access intuitive button operations and voice prompts. The volume of each device can be individually set and controlled. The SPH10 will offer the best sound quality for both incoming and outgoing sound. Its intercom has a range of up to 980 yds (900 meters) in open terrain. The intercom has a 4-way conference option, enabling you to simultaneously talk to up to four different riders. The SMH-10 is durable and water/sweat resistant. It allows up to 10 hours talk time and up to 7 days of standby. The SPH10 is Firmware upgradable and has a two year warranty. Check out the Sena SPH10 Bluetooth Intercom System, Sena Products, and other motorcycle communications devices on our website: CompetitionAccessories.com!