features: - completely wireless system - a circular signal area based on central of transmitter and the remote control range is up to 500 meters. -an unlimited number of receivers supported at the same time. -100 levels of transmitter signal intensity to adjust the remote control range. -the current intensity will be display in transmitter screen. -very easy to make pairing for transmitter and receiver. -waterproof and rechargeable collar receiver. -progressive warning tone. -multiple collars operation. -water-resistant tpu collar fits dog neck sizes under 22''. specification: product name: pet fence model: kd-661 color: white material: absacrylonitrile butadiene styrene transmitter size: 14x8x3cml x w x h receiver size: 7x4x2.5cml x w x h strap length: 70cm strap width: 2cm power supply input: 100-240v/50-60hz/0.35a output: 5v/1a plug: us plug package included: 1 x wireless transmitter 2 x collar receiver 2 x adjustable tpu strap 1 x charger 8 x metal contact probes 2 x screw 2 x screw holder 2 x led test light 1 x user manual note: 1.the wireless fence system is intended to use for dogs only. 2.a low battery may cause intermittent operation. do not use it and charge it immediately for a low battery. 3.do not leave the collar on your dog for more than 1 hours per . 4.keep the receiver collar awaychildren. 5.read all instructions before using this product.