Portable USB Rechargable to Keep Your Pets within 20 Meters Around Main Features: Small, exquisite and portable 100db warning voice with LED flashing light RFID technique with the strong anti-interferential function Consist of two parts: Master(belongs to pet owner)and slave-master(belongs to pet) How to USE: 1.Attach the slave-master(which including transmitter)on dog collar 2.Turn on the switch for the both 3.the two devices are connected when the LED indicator on the slave-master slowly flashes NOTE: The slave-master MUST be attached on pet collar The collar size could be adjustable to a suitable range according pet neck size The maximum size is 65cm Specification: General Color Black, Yellow Feature USB Recharge, Low power alarm Special Function LED Torch Power Supply Charging through USB cable Function Info Controller Working Distance 20 meters Specification Standby Time 70 hours(The master), 30 hours(The slave-master ) Weight/Size Product Weight