Wireless Access Points offer a wireless connection to you network through WiFi. Access Points are normally powered by POE and require a Ethernet cable connection to a POE switch or POE injector. Typically Access Points are connected to the network via a cable, however some units do support wireless connections. 

Wireless Access Points do not necessarily require professional installation but they do require a degree technical understanding. 

Home Network Solutions Berkshire sells Ubquiti Unifi and Tp-Link Omada Access Points.