AVENEL, N.J. — Mizco International has introduced iEssentials’ RoboBuds T earbud headphones for children, featuring a built-in volume control to protect children’s hearing. The new line of earbuds includes five colorful “robot’’ character designs — Phantom, Streke, Electrika, PowerBot and CrimsonRobo. The earbuds are designed with a volume limiting output of 85 decibels. The line was created to provide kids of all ages with a high-performance audio accessory that is safe to use and fun to collect. The earbuds retail for $9.99. Mizco plans to add over-the-ear headphones to the RoboBuds lineup later this year.