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Specifications: Rated voltage: 100V-240V Rated power: 36W Ball out frequency: 40-70/minutes Ball speed: 4-40 m/s Spin direction: multi-spin, up and down, right and left Dropping: Fixed dropping Ball switch: Short ball/long ball switch Load ball: Around 120pcs Weight: About 4Kg Package Size: 41*36*32 cm Features: *Double-head can serve 9 kinds of spin balls and one not spin *Double-head can adjust the serve angle of ball up and down *It can be randomly adjusted angle of left and right *It can be served different long or short balls Package List:1 Set of ping-pong ball robots