Wireless devices are the largest part of the Internet of things (IoT) units. Radiated, such as specific absorption rate, and spurious related issues are regulated by the standards bodies. The functionality performance will greatly influence IoT system stability, user experience and cost. Radio receiver desensitization and coexistence aspects of IoT devices are discussed in this paper. Measurement technologies are briefly reviewed for transmit/receive mode only of single-input and single-output, and multiple-input multiple-output devices, to provide a means of device performance evaluation and electromagnetic interference trouble shooting. An understanding of the electromagnetic compatibility aspects of the IoT and its measurement methods can help ensure the best user experience for ubiquitous wireless systems.