Features: Effective training anti-bake device. The levels can be altered by use of up & down button. A tone button activates a tone on the receiver. This system is used for only 1 receiver. The receiver will TURN OFF if it is unused for 4 minutes. Any movement will activate the receiver into STANDBY MODE. The transmitter will go into STANDBY MODE if there is no operation after 20 seconds and turn off after 2 minute. Collar Size: Able to fit small, medium, large dogs and puppies. 15 lbs or Larger. Durable and adjustable Nylon Collar Size Length from 14 to 24 inches long Includes one collar, Remote Transmitter can control up to two collars. (Extra collars are sold separately) Uses: Our collars can be used for a variety of purposes. Here are a few examples: Basic Dog Obedience, Hunting, Digging, Aggressive, Barking, Jumping up, and bolting Battery Type: Replaceable Batteries Range: 330 Yards Tone/Vibration Options: 100 Levels of Vibration and 1 Level of Standard Tone Stimulation Levels: 100 Levels of Static Shock Power saving design with Automatic Standby and Memory Function Easy to use design and operation Light Mode to assist seeing dog in low light conditions Effective and safe training system with Auto-Protect Mode Convenient, easy to read LCD Screen shows the stimulation level Descriptions: Easy to operate and ergonomic Transmitter. Adjustable belt length, maximum length up to 18inches, two pairs of metal prong (short/long) to suit dogs with varied fur thickness. Specifications: Material: plastic Color: black Power: by 2 x Batteries(included) Size: 125*45*33mm Package Included: One Set Of Anti Bark Training Collar Notes: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, thank you. Tips: Before using, you need to connect transmitter and receiver. ① Put batteries into the transmitter and check if the remote is work. ② Put batteries into the receiver, there will be a beep from the receiver. ③ Press "Y" button on the transmitter within 10 seconds. The collar receiver will beep if connected successfully.