This device is compliant with Part 15 of the FCC Rules. Operation is subject to the following two conditions:1. This device may not cause harmful interference, and2. This device must accept any interference received, including interference that may cause undesiredoperation.Note: This device is tested and complies with the limits for a Class B digital device, pursuant to Part 15 of theFCC Rules. These limits are designed to provide reasonable protection against harmful interference in aresidential installation. This equipment generates, uses, and can radiate radio frequency energy and, if notinstalled and used in accordance with the instructions, may cause harmful interference to radiocommunications. However, there is no guarantee that interference will not occur in a particular installation. Ifthis equipment does cause harmful interference to radio or television reception, which can be determinedby turning the equipment off and on, the user is encouraged to try to correct the interference by one or moreof the following measures:1. Reorient or relocate the receiving antenna.2. Increase the separation between the equipment and receiver.3. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.4. Consult the dealer or an experience radio/TV technician for help.To avoid potential effects on the environment and human health as a result of the presenceof hazardous substances in electrical and electronic equipment, end users of electrical andelectronic equipment should understand the meaning of the crossed-out wheeled binsymbol. WEEE must not be regarded as unsorted municipal waste and must be collectedand disposed of separately by a competent authority.We are striving to improve our documentation quality and we appreciate your feedback. Emailyour opinions and comments to DocsFeedback@yealink.com.