Kestrel 4500 with Applied Ballistics / Bluetooth , Kestrel hand held weather station with advanced Applied Ballistics Software and bluetooth. Can be paired with your Android device to provide realtime ballistic solutions for extreme long range shooting, including updated wind information. Updated with latest sofware, capable of connecting to your laptop / computer to upload the Applied Ballistics G1, G7 or Custom profiles for all calibers at no costs, as database is on device or free AB software. Refer Kestrel website for further information on 4500 models.