?This is 813 Remote Dog Training Collar. This training system is specifically designed for hard to train， stubborn dogs. You know some dogs are not sensitive to other kinds of training signals. If you want to get your dog▽s attention， this is the solution. It▽s fit for small/medium/large size dog as long as your dog▽s neck suits the adjustable collar length.Note: Pls read the instructions carefully before using the product                                    Features            Uses vibration instead of static stimulationTwo levels of vibrations and whistle150 yard rangeReceiver is powered by 2pcs AAA 1.5V batteriesTransmitter is powered by 1pcs 23A 12V batteryPerfect for call or training petsFit for 5-27 pounds dog                                                            Specifications            Transmitter         <br>Height    3.39"    <br>Width    1.46"    <br>Depth    0.63"    <br>Weigt    40g    <br>Frequency    433.825MHz    <br>Red light on face        <br>Screw off battery cover and belt clip on back        <br>Receiver collar         <br>Height    1.26"    <br>Width    2.17"    <br>Depth    1.18"    <br>Weigt    75g    <br>Collar    w3/4" - l23"    <br>Green light on side        <br>                                                            Package Includes            1 x Transmitter1 x Remote1 x Receiver1 x Special screwdriver3 x Screws2 x 1.5v batteries1 x User manual                                                            Extra Info            Note: 1.Pls read the instruction carefully at first. <br>2.Dont make it too tight while the discharging point of the receiver can touch the neck of the pet. <br>3.The static impulse is to curb the improper deeds of the pet. Dont use it casually or to make fun of the pet. <br>4.Training the dog is to let it associate the static with the vibration. Reduce using the static gradually. <br>5.The strong static impulse is only used in emergency <br>6.If you do not use this product， take the collar and receiver off the dog and place them in a place without vibration.Don▽t wear it on the dog all the time. <br>7.If you dont use the collar remote for a long time， take out the batteries <br>8.There is a vibration sensor switch in the receiver，you just need to put it alone， then the power of it will be turned off automatically.