PROTECTIVE BOX - Clean and hygienic. Replacement heads not included EASY TO USE: Clamshell design for easy access STURDY AND DURABLE - Can be used for a long time, pay attention to cleaning COMPATIBLE MODELS - Compatible with Waterpik Water Flossers Aquarius, Aquarius Professional, Complete Care, Cordless Freedom, Cordless Plus, Cordless, Cordless Advanced, Cordless Express, Cordless Professional, Cordless Select, Traveler, Ultra, Ultra Plus, Nano, Nano Plus, Water Flosser For Kids NOTE - not compatible with Sidekick (WF-04), Classic Water Flosser (WP-60/65/72), Whitening (WF-05, WF-06) PROTECTIVE BOX - Clean and hygienic. Replacement heads not included