Comfort Zone CZ310R is a versatile twin window fan with remote control, designed for indoor residential and office use. It features three fan functions: COOL brings fresh air in, EXHAUST removes stale air, and CIRCULATE creates air circulation and room ventilation. The fan has three-speed settings (LOW, MEDIUM, HIGH) and can be adjusted to fit windows from 23-1/2" to 37". Safety features include a long-distance full-function remote control, safety grilles, and a polarized plug for electrical shock prevention.