Customers can configure their ProFlight Series 2 Aviation Headsets in many ways. Customers have their choice of connector configurations with each module. Each connector configuration is available with Bluetooth, and non-Bluetooth variants in dual-plug and 5-pin configurations. Designed for use in both civilian and military aircraft, the ProFlight Series 2 offers most common plug configurations:Dual G/A plug (PJ 068 and 1/4-inch stereo): With this option, the headset is connected to the aircraft’s intercom via a dual plug and is not powered by the aircraft. Two AA alkaline batteries provide a minimum of 45 hours of operation while flying. This configuration is the most common version purchased by pilots.XLR five pin: Often called the Airbus plug, this configuration is a mono connection to the aircraft and may be powered by the aircraft, depending on the installation. When disconnected, the flexible power feature lets the headset switch seamlessly from aircraft power to battery power, so users experience no interruption when the headset is plugged into or unplugged from a source of power.Six-pin connector wired to the aircraft (LEMO): With this option, the headset is connected to the aircraft via a 6-pin connector and is powered directly from the aircraft. When disconnected, the flexible power feature switches the headset seamlessly from aircraft power to battery power, so users experience no interruption when the headset is plugged into or unplugged from the aircraft.**Adapters are available from Bose to convert a six-pin connector to either a dual G/A plug or a U174 for additional connection flexibility.