The Wireless Bridge for switches from Harwil Corporation eliminates wire, installation (conduit or trenching) and maintenance that would normally be needed for a switch to control a device. The range can cover distances of 1,000 feet. The system includes a switch sending unit that can be attached to two separate switches and a relay, and receiving unit that has 10- and 15-amp relays. It can be used to control water levels in a tank, detect moisture intrusion or line breaks, remote control on/off status of equipment during installation or service. This system is ideal for temporary and portable applications. The two-switch unit allows forward/reverse or up/down remote control. The switch unit is powered by 9-24 VDC or three C-cell batteries. Relays are powered by 12-24 VDC, 120 or 220 VAC. 800/562-2447; www.harwil.com.