If you frequently use your Reliefbandfor motion sickness, keep extra Relief Band conductivity gel and CR-2025 lithium batteries on hand. The Lectron II conductive gel and two CR 2025 lithium batteries work with all Relief Band including Premier, Explorer, Adventurer and Reliefband OB units. Re-apply conductive gel every 3 to 4 hours or when nerve stimulation decreases. Maintaining a constant level of nerve stimulation with your Reliefband is required to control or prevent motion sickness nausea and/or vomitting. The red LED flashes when Relief Band batteries are low. Insert 2 batteries with positive terminals down. 2 batteries are required for Relief Band operation. Note: Manufacture of Reliefbands was discontinued by the manufacturer Neurowave Technologies in 2010. Lectron II Gel is 2 fl. oz. Made in USA by Pharmaceutical Innovations.