A basic e-collar with the versatility and ruggedness of more advanced models, the SportDOG SD-350 trainer delivers adequate basic training range. Instant correction-level adjustments in both momentary and constant let you customize the training. A tone feature also gives you the option of constant communication with your dog. DryTek™ technology makes this unit 100% waterproof for reliable function in any weather. Long-life NiMH rechargeable batteries (included) give you up to 40 hours of use on a single charge. Low-battery indicator is easily visible. Also includes long contact points for longer-haired dogs. Range: 300 yards. Transmitter weight: 3.3 oz. Collar weight: 2.8 oz.