Dog Training Collar Transmitter by iPhone, iPad, iPod 5G Samsung S3/S4 and Android 4.2 Devices Important notice: the mobile devices must be iPhone4S/5 ,iPad2,0/3,0 ,iPod with Bluetooth 4,0 and Samsung with Bluetooth 4,0 Prepare the Receiver Collar Charge the Receiver collar 1 Lift the rubber cover then connect the charger to the charging hole 2 When charging the receiver the red LED light will show up and change to green after fully charged 3 Put back the rubber cover to the charging hole