Rechargeable Herbal Flea Collar Repels Fleas, Ticks, Mosquitoes, Gnats and Biting Flies Rechargeable-Lasts up to Three Months Pleasant Herbal Scent The Herbal Flea Collar contains a sturdy cotton collar you can trim to fit, and a 1/2oz. (14.8ml) bottle of Insect Shooo recharging solution. Ingredients: Oils of Citronella, Cedarwood, Lemongrass, Rosemary, and Sesame.