Two dogs were extended training with the same transmitter (sold separately,you can add the 2nd receiver collar freely )           The necklace is a combination of micro static discharge, vibration, whistle and LED light.          Works up to 500 meters range  Important notice: The Receiver Collar works only if it is correctly encoded with Remote Transmitter, therefore, please follow the setup steps in User Manual carefully when you use the tool for the first time. Features: 1. Remote transmitter is small, flexible and simple to use. 2. Receiver Collar is Diving Swimmingwaterproof, so you can use it in damp rainy days and ok for dog swiming !   3. Levels of vibration and electrostatic shock are adjustable, and a proper level has to be determined when you use this tool for the first time, you are advised to try Level 1-100 gradually. 4.   function modes are available: Static / Vibration / Beep 5. Remote control range of 520 is as far as 500 meters.(without any disturbance) 6. Two signal channels on one remote transmitter can control two receivers of the same transmitter . 7. Energy-saving design offers automatic standby and memory functions. 8. This model is suitable for most medium and small-sized dogs. Related descriptions: 1) Antenna: transmit the signal to Receiver Collar. 2) 3) Indictor: when remote transmitter is working, the indicator flashes. While being charged, it turns red. 4) LCD Screen: Static mode: under this mode, press Y button, Receiver will release static shock. And press Up / Down button to adjust Static level from 0 to 100. Vibration mode: under this mode, press Y button, Receiver will vibrate. And press Up / Down button to adjust Vibration level from 0 to 100. Beep mode: under this mode, press Y button, Receiver collar can give a “beep” sound. And volume can't be adjusted. Light mode: under this mode, press Y button, the green LED light in Receiver Collar will flash continuously to let you know where your pet is. Signal Channel 1-2: press button 7) to select Signal Channel 1 or 2 for signal transmission to Receiver Collar. NOTE: for PD 265 BL-1, you can use either Signal Channel if you have purchases only one Receiver Collar, while for PD 265BL-2, you have to select one Signal Channel to match signal transmission to one of the two Receiver Collars. After you have determined Signal Channel, please follow steps in User Manual to encode signal transmission between Transmitter and Receiver Collar. 5) Up/Down button: to adjust levels of Vibration and Static Shock. 6) LED Flashlight button: press to turn ON the LED Flashlight in the Transmitter. 7) Signal Channel button: press to set either channel fro signal transmission. 8) Launch button: press to start training after you have selected your desired function mode... 9) Mode button: four modes including Static Shock, Vibration, Beep and Light are available. 10) 10.Charging Socket: to charge the Transmitter. ON/OFF button: to turn ON/OFF the Receiver Collar, encode signal transmission with Transmitter or signal reset. Contract (electrode): a pair of screw caps (electrode contacts) to suit dogs with varied fur thickness is installed for effective static electricity transmission so that to achieve good training outcomes. 10) Charging Socket: to charge the Receiver Collar. Rubber Cap: keep the Receiver Collar closed when using. Warm Notice: 1. Both Remote Transmitter and Receiver Collar are energy-saving designed. The Remote Transmitter will go into STANDBY MODE if there is no operation after 1 minute, and by pressing Mode button you can activate the transmitter from Standby mode. The Receiver Collar will go into Standby mode if no operation for 4 minutes. And any movement will activate the Receiver. 2. A startup roller is contained in Receiver Collar, so you will hear sound when the collar is shaking, don't mistake it as any parts falling off. Encode signal transmission between Remote Transmitter and Receiver Collar: 1. Press Mode button to turn on Remoter Transmitter and adjust levels of Vibration and Static above 0. 2. Press “1/2” button to select a signal channel. 3. Open the rubber cap and press the switch button inside Receiver, which beeps once to indicate the Receiver is on. 4. Press Y button within 10 seconds to encode the signal, at the same time, the Receiver beeps once. 5. If you fail to press Y button within the 10 seconds period, please repeat steps above. 6. If you have 2 Receiver Collars, press again “1/2” button to select another signal channel for transmission encoding. You need charge this product before you start using it for the first time. How to charge Remote Transmitter: 1) Connect Remote Transmitter to a charger into a standard socket. 2) LED Indicator on Remote Transmitter turns red when charging. 3) Once Remote Transmitter is fully charged, the red LED indicator turns off automatically. How to charge Receiver Collar 1) Open the rubber cap, connect Receiver Collar to a charger into a standard socket. 2) LED Indicator on Receiver Collar turns red when charging 3. After being fully charge, LED indicator turns yellow and goes into Standby mode if there is no movement. Warm Notice: 1) Charge the Remote Transmitter and Receiver Collar at least 6 hours for the first charging. 2) Functions of Receiver Collar are disabled and out of control of Remote Transmitter when being charged. 3) Low battery indicator symbol    will be displayed on LCD screen. 4. Receiver Collar keeps beeping continuously if its voltage is under working level. 5) This product is rechargeable. To maintain its proper functions, please charge once a monthly if it is not used. Warm Notice: Remember your signal channel setup and don't change it frequently, otherwise remote control does not w