The 4921 RF Shield is an effective and robust RF shielding solution for use in testing 3G mobile phones, data cards and WiFi terminals in service centres and production facilities. The 4921 is the ideal solution for service providers and manufacturers with a high test volume. The 4921 RF Shield easily meets the requirements that arise here, such as multiple opening and closing of the box. The RF Shield eliminates interference caused by nearby mobile phones and the local base station and protects the environment from RF radiation from the tested mobile phone or terminal. Strict shielding requirements for testing 3G mobile phones. The 4921 exceeds the requirement of 80 dB attenuation for testing mobile phones and other wireless network devices. The RF absorption inside the 4921 provides low reflection within the box, ensuring that the measurement instruments connected to the 4921 deliver highly accurate and reliable RF measurement results.