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material: abs + metal comes without the battery and instructions adustable size 4 rings for roots of penis and middle of the penis. double output host, stimulate penis and anal at same time. instructions : 1. install 2pcs 1.5v battery, 2. keep press " power " button 3-5 seconds until the light is red. 3. choose the modes : pulse / numb / absorb / auto. 4. role the roller down slowly, until adjust it to strength that suitable for you. ( the roller on the up right, can control the strength, up is weak, down is strong ) 5. "adjust": it can control the shock frequency, it work a while and pause , then work, not keeping work.