Low power WIFI module user manual http://en.usr.cnJinan USR IOT Technology Limited tec@usr.cnPage 14/721.2.3. Mechanical SizeUSR-WIFI232-T modules physical size (Unit: mm) as follows:Figure 2. USR-WIFI232-T Mechanical Dimension1.2.4. External AntennaUSR-WIFI232-T supports two way of external antenna as the followingpicture show, The IPEX interface or the PAD interface. The user may chooseone of them. If user select external antenna, USR-WIFI232-T modules mustbe connected to the 2.4G antenna according to IEEE 802.11b/g/n standards.The antenna parameters required as follows:Figure 3. USR-WIFI232-T External Antenna picture