This water-resistant Bluetooth® headset was designed to give you a stable, secure fit in any situation. Use the Expand to communicate from headset-to-headset, take hands-free phone calls, or listen to music from your smartphone. Built to be water and sweat resistant, you won’t have to think twice about keeping your Expand headset on your head as the weather rolls in. Bluetooth 3.0 technology allows for four-way intercom over a 900-meter (half mile) range. Advanced Noise Control™ ensures noisy outside environments won’t interfere, and each audio source has its own volume level which can set to your preference. Expand uses the Universal Intercom™ protocol, which makes your gear compatible with other brands. General. Talk time: up to 10 hours. Charging temperature: 0°C – 45°C (32°F – 113°F). Operating temperature: -10°C – 55°C (14°F – 131°F). Dimensions: main module - 145 mm x 115 mm x 78 mm (5-11/16" x 4-1/2" x 3-1/16"). Weight: main module - 91 g (3.21 oz). Intercom. Working distance: up to 900 meters (980 yards) in open terrain. Supports up to 4 riders. Battery. Type: Lithium Polymer Battery. Charging time: 2.5 hours.