Mallory Sonalert’s JR series ultra-compact 30 mm stack lights utilize state-of-the-art LEDs and have the lowest cost and most functionality in the industry. Customers can order one, two, or three stacks (red, yellow, and green), and with or without sound. For those users who need an audible sound, seven different sound tones are available, including a continuous tone, chime tone, and five different pulsing tones. The JR series small stack lights can be mounted directly onto the equipment or purchased with a 4 inch pole for extra visibility. The sound and light stacks are controlled independently giving the machine designer total control over which lights or sound is activated at any given time.