PETINCCN P680 660 Yards Remote Waterproof Rechargeable Dog Training Collars with Four Functions of Tone Range Finding and 100 Stimulation Levels for Vibrating Static Shock Trainer Collar 2 Collars1. The receive collar is small.Able to fit small, medium and large dogs.Collar Size: 2.8″(L)*1.4″(W)*0.9″(H).Collar Weight:0.1 Pound 2. Range up to 660 Yards. 3. Remote Training Collar with 4 Functions: Range finding,vibration, shock, Tone.4. Range finding definition:Can be detect the distance between Transmitter and Receiver.5. Tone/Vibration/Static Shock Options: 100 Levels of Vibration or Static Shock and 1 Level of Standard Tone.If you set 1 level for Static Shock, the voltage is very low.Can protect your dog. 6. Remote Transmitter can control up to two collars.Waterproof Collar Receiver.7. Power saving design with Automatic Standby and Memory Function. 8. Battery Type: Rechargeable Lithium Batteries for Collar Receiver and Remote Transmitter.9. Battery power can be displayed by three different colors of the indicator light. Green indicates that the battery power is greater than 40%, orange indicates that the battery power is greater than 10% but less than 40%, red indicates less than 10%.In addition 3-bar battery life indicator.10.Charging cable is the Android general Microusb cable. 11.Convenient, easy to read LCD Screen shows the stimulation level.12.When you get the product. Products can be used after charging, without any other operations.