FCC&CE compliant. Frequency: 433.92MHz The RF power of the handset: 8dBm The RF power of the bear: 6dBm The effective find-distance: ≥ 60m The two-way alarm (Child Locator Alert) is composed of Bear-transmitter (Bear) and Primary Receiver Transmitter (Handset). To locate your child, press the find-button, the bear will continuously sound to help you locate the position of your child within the effective distance (about 180 feet). Range may vary from place to place depending on the environment. If the bear is more than 8m(26 feet) far from the handset, the handset will sound until it can receive the signal from the bear. To prevent the children leave the rang from the parents, if this happen, the system will alarm and the parents will find their children soon.