The SportDog DSL-400 beeper collar let's you know when your dog is pointing even if you can't see it. It comes with the best in the market features you've come to expect from Sport Dog training equipment. SportDog DSL-400 Beeper Collar Features: Four adjustable alert sounds include Standard Beep Tone, Hawk Scream, Trill, and Bob White. 100dB Sound Output from Beeper, can be heard up to 400 yards. Waterproof Three adjustable Modes of operation include Single Beep / Point Only, Single Beep / Point and Run with short delay, Single Beep / Point and Run with long delay. Smalles and lightest Beeper Locator n the market with a size of 5.8 cubic inches and weight of 3.0 ounces. High and Low volume adjustment for multiple terrains Low battery detect Exclusive Lifetime Warranty This bark collar is adjustable to fit neck sizes from 6 to 28 inches, its very light weighing only 1.5 ounces, its waterproof, has 18 levels of automatic dog determined correction, and is covered by SportDog's exclusive lifetime warranty. The SBC-18 also has SportDog's duel sensor technology to ensure Perfect Bark detection at all times. SportDog SBC-18 Bark Collar Features: 3 correction settings, each with six levels for a total of 18 levels of correction Collar adjustable to neck sizes from 6 to 28 inches No programming required Automatically adjusts to deter barking Dual sensor technology for Perfect Bark ™ detection every time Low battery warning light The lightest bark collar available – only 1.5 ounces Uses PetSafe RFA-67D-11 batteries Exclusive lifetime warranty