XLF 4.5v
The XLF 4.5 Volt operates at a higher voltage allowing it to achieve higher output power than the 3 volt model.Backed by years of experience, research, and development, these transmitters are made using special machined parts and state-of-the-art micro-electronics. The batteries slide into the aluminum case and activate once you screw the cap down firmly. All XLF transmitters have screw type replaceable antennas built on standard size screw studs which can be easily replaced in seconds.Our Loaded Antennas can be used with all XLF models. 
These antennas are shorter in length at 6.5 inches without sacrificing much range.Weight: 6 grams. Battery Life: 6 days (~144 hours) continuous operation.  
Range: 25 miles