Custom Jewelry & Bracelets, Red Light Up Pendant Necklaces - LED Multi-Mode, Our Red LED Pendant Necklaces come in a variety of shapes to light up your message with this high quality acrylic pendant on a 24" necklace. A high powered LED built into the necklace will create a brilliant promotion. Multi function switch allows for three lighted modes - slow blink, fast blink or constant on. 2 replaceable CR1620 batteries included and installed. Choking hazard, not for children under 3 years. ... #LIT904 $3.24/each.