Telephones and cell phones convert voice or other sound signals into a form that can be transmitted to another device that receives and reconverts the waves back into sound.

Power over Ethernet (PoE) products use network cables to deliver DC power and data to network devices. PoE products use RJ connectors instead of AC-DC adapters and eliminate the need for separate power cables.

VoIP and IP telephony allows PC users to make phone calls over the Internet or other packet networks via gateways and standard telephones

Switches are devices that allow electric current to flow when closed and prevent current flow when opened. Switches, All Types are a high level search form that includes options for all switch types. Search forms for specific switch actuator types are also available

Loop powered devices are modules and computer boards which are powered by the system they serve. They derive their power from the input current loop instead of from an external or additional power source

Pushbutton switches are mechanical switches defined by the method used to activate the switch. The activation method is typically in the form of a plunger that is pushed down to open or close the switch

Switch boots protect switches from contaminants such as dirt, dust, gas, and liquids.  They are generally tough, pliable silicone rubber devices for toggle, pushbutton, rocker and rotary switches

VME switches and VXI switches are used in industrial systems to connect test points, or devices, to instruments for the purpose of testing, measuring or monitoring the system

Liquid level switches are used to detect specific liquid levels or interfaces between liquids. These level measurements are indicated via an electrical switching action

Touch-sensitive and tactile switches operate by touching or pressing to make a connection. Touch-sensitive switches are touch-operated switches that do not have moving parts, while tactile switches are electromechanical and provide tactile feedback

Reed switches are magnetically actuated switches. They are typically manufactured with two ferromagnetic reeds (contact blades), which are sealed in a glass capsule. In the presence of a magnet, the blades (contacts) close. 

Pressure switches are actuated by a change in the pressure of a liquid or gas.  They activate electromechanical or solid-state switches upon reaching a specific pressure level

Suppliers of membrane switches and keypad assemblies using flexible membranes, domed or flat switch profiles, and tactile and non-tactile switches and panels

Power switches are used to apply power to or remove power from instruments such as large-scale factory equipment

Eddy current proximity sensors and switches detect the proximity or presence of a target by sensing the magnetic fields generated by a reference coil