Lightspeed Tango Wireless Aviation Headset w/Extra Rechargeable Battery Lightspeed Link technology  At the heart of Tango is Lightspeed Link. Developed by Lightspeed engineers to ensure the reliable communication pilots demand, Lightspeed Link is not Bluetooth or WiFi, but incorporates existing technologies chosen for both signal reliability and audio quality for the aviation environment. Panel interface  The panel interface is the vital hub of the Lightspeed Link system, routing communication between the headset, the intercom, and auxiliary devices. Wrapped in an attractive and durable case, it houses the lower cable, which is adjustable to 31 inches. 21st century power  In yet another Lightspeed first, Tango is the first aviation headset powered by rechargeable lithium ion batteries, a power source trusted in countless critical applications. Lightspeed's rechargeable lithium ion batteries deliver twelve hours of continuous operation while offering earth and wallet friendly reusability in a compact size. Built-in redundancy  The panel interface also stores the backup cable, instantly available for uninterrupted communication, in the event the batteries become depleted. Outstanding quiet  Tango delivers the advanced noise cancellation you expect from Lightspeed.