The GateGuard Wireless Access Control System from Ritron Inc. of Carmel, Indiana, allows wireless two-way voice communication with visitors and remote control of gates. Portable-radio-equipped personnel can talk with visitors and activate a gate from up to two miles away. A compact base station radio is also available and provides a fixed station for two-way communication and remote control. The industrial-grade system is weatherproof and tamper-resistant and works with most VHF and UHF business-band, two-way radios. The callbox can be powered by external power, six D-cell batteries, or the company’s solar power kit.