EtekStorm Electric Dog Training Collar With Remote Rechargeable & Waterproof LCD Screen 330 Yard Beep/Vibration/Shock For Small, Medium, Large Pets&Dogs(For 2 Dogs) 1.Choose channel by pressing the 1/2 button on the remote 2.press the receiver's on-off button to turn it on 3.KEEP pressing the receiver's on-off button for few seconds until the light on the receiver flashing 4.press the Y button on the remote. Then the remote and the receiver will connect successfully. 2.About the charging issue 1.Try to use an android or iphone charger instead of the charger we provide to charger the remote,better for hours 2.Charge the remote and receiver BEFORE the battery totally run out 3.Don't try to charger the devicse in the computer VK-BEST's Remote Training Collar is made of RF434Mhz technology, offering a wide range of 330 yards. Can control up to two dogs, includes two collar receivers Receiver's backlit LCD screen and easy to press buttons allow easy usage, and power saving battery makes longer life time. 100% waterproof design allows your dog's collar to stand up to rough outdoor play, rain or shine. Useful 4 modes of operation: vibration, electric shock, beep, flashing lights. 100 available levels of static shock and vibration stimulation. Fits all dogs 15 lbs and under and collar sizes 7-26 inches.