R2lab is an open testbed located in an anechoic chamber of about 90m2 for reproducible research in wireless WiFi and 4G/5G networks. R2lab is part of the OneLab federation, an open large-scale testing infrastructure for systems and applications on wireless and sensor communications. Located at INRIA Sophia-Antipolis, R2lab proposes thirty seven customisable commercial off-the-shelf wireless devices, together with USRP nodes and commercial LTE phones, in order to create rich experimental setups. The testbed also features advanced software-like leverage GnuRadio and OpenAirinterface, as well as efficient software tools such as nepi-ng (https://nepi-ng.inria.fr/), to support easy experimentation.