matching receiver and transmitter : 1. turn on the transmitter by the switch on right side of it 2. install the batteries for the receiver. the led inside the receiver starts to keep flashing. press vibration or shock button immediately after batteries are put into the receiver firmly. then the led will stop flashing and only light which indicates that the transmitter and the receiver have matched each other successfully. 3. if led stops flashing on its own without press any button in the transmitter, take out the batteries. wait for at least 10 seconds and try step 2 again. 4. put the cover on the receiver firmly 5. attach the receiver to the collar. features: 1. remote training collar with lcd display.2. patented design.3. for mild-mannered to stubborn disposition dogs.4. easy to use and ergonomic transmitter.5. rheostat dial allows for gradual adjustment in stimulation intensity.6. with no jumps between 0 and 100 levels.7. 300 meter range.8. static and vibration mode.9. no external antenna on collar.10. easily visible lcd screen displays level of stimulation.11. over 3,000 different identity codes to prevent conflicts with other e-collars.12. three bar battery life indicator on transmitter. specification-collar: length: 43mm , height: 68mm , width: 38mm.collar length adjustable from 35cm to 58cm.weight: 56g (module + battery)power: 2 x 1.5v aaa battery (included) 产品简要说明： 1.lcd数显功能，简单操作，效果明显. 2.100档调节脉冲电击强度和振动强度,适合大中小型犬. 3.在无干扰和障碍物的情况下有效遥控距离300米左右. 4.带省电功能，可以发出声音和有闪灯功能，有寻狗器功能.5.用两个普通7号（aaa）电池，遥控器用两个4lr44 6v电池.产品描述： 远程培训项圈与led显示器 *易于使用和符合人体工程学的发射机 *变阻器拨号可以逐步调整刺激强度 1.lcd数显功能，容易操作 2.100档调节脉冲电击强度和振动强度 3.遥控距离300米 4.带省电功能 5.用两粒7号（aaa）电池， 6.摇控器用两粒6v（4lr44）电池， 7.软的遥控的控制器天线是防残破的。 发射机： 12.8 * 4.8 * 2.8cm 接收机： 7 * 3.6 * 3.8cm 礼品盒： 16 * 13.5 * 4.3cm 建议零售价 : 200.00 ; 适用对象 : 狗 ; 颜色 : 黑 ; 是否进口 : 否 ; 是否货源 : 否 ; 可否伸缩 : 可以 ; 产品类别 : 其他 ; 材质 : 塑料 ;