Wireless LAN antenna products work by sending radio transmissions on specific frequencies where listening devices can receive them. The connection range of a Wi-Fi device depends greatly on its antenna's power gain. The necessary radio transmitters and receivers are built into Wi-Fi enabled equipment like routers, laptops and phones. Wireless antennas are also key components of these radio communication systems, picking up incoming signals or radiating outgoing Wi-Fi signals. Some wireless LAN antennas, particularly on routers, may be mounted externally while others are embedded inside the device's hardware enclosure.