The Smith Outdoor Tech Wireless Audio Chips Bluetooth Helmet Speakers are loaded with the latest Bluetooth 4.0 chipset technology providing voice prompts that replace tones for incoming calls and volume controls, as well as a new battery gauge so users won't have to worry about losing power unexpectedly. They boast the patented glove and mitten-friendly button controls directly on the earpiece for adjusting volume levels, answering calls, controlling track selections and even activating Siri or voice commands. Wireless CHIPS have a rechargeable battery that lasts for 10 hours of continuous playtime or about three days of real world on-mountain use while providing endless freedom from wires and the fear of dropping your phone off a lift. Open up. Drop in. Rock out.