manual for 298 1.turn the bottom cover, put in the battery according to the direction, then tighten the cover. 2. press the button of the upper spot for "on" function, press the button of the down spot for "off" function. 3. pull out the brush head, replace by dental floss, then it will become the electric dental floss. the floss is one time use and the seating can be used repeatedly. 4. put it to the dry place after cleaning. special sugguestion: a. it is better to change the brush head for every 3 months. b. the product is suitable for the child over 3 years and adults. Note: 1. the bristles of the brush is made of Dupont-tynex USA, which is well grinded and softened. 2. the round brush head can two direction rotate and the square brush head is designed up and down movement uprightness to toothbrush hand. This combination is the most scientific way to clean the teeth. Moreover, the high speed rotation(5000 times/minute)and movement can remove thoroughly the tartar and germs on the surface of the teeth. 3. the design is quite convenient for the people who like to use the dental floss, only if you do according to the instruction 3.