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The SD-Beep Add-A-Beeper is the easiest way to add another beeper to your SportDog® Brand system. The SD-Beep's DryTek™ waterproof design eliminates worries about use in wet conditions. Realhawk® beeper sound keeps birds tight to cover. Select from 9 tones and 3 run modes (silent, 5-, or 10-second beep). You can extend tone range out to 1 mile. The beeper charges in 2 hours. When paired with the UplandHunter® 1875 system, it provides an instant locate feature with the touch of the transmitter button. It is also compatible with the SportHunter® 1825 SD1825, WetlandHunter® 1825CAMO and ProHunter® 2525 systems.