This auction is for a Garmin GDL-39 with battery.  This is a great way to get traffic and weather.  I will never fly without ADS-B-in information again, but I am selling this due to an aircraft panel upgrade.  This would be a great addition if you fly multiple airplanes or rent aircraft without this great situational awareness information.  Some of the features include:

• Recieves subscription-free weather
• Advanced ADS-B "dual-link" traffic with TargetTrend™ and TerminalTraffic™ technology
• Wireless Bluetooth® connectivity with iPad®/Android™ devices or aera 796/795
• Built-in WAAS GPS receiver
• 4-hour  battery life with desktop charger
• Cigarette  lighter charger that works with 14-28V electrical systems    

I have had this unit just over a year and it works great.  This auction comes with:

• GDL 39
• Battery
• Tray
• Desk-top and cigarette lighter chargers
• Carrying Case
• Users Guide