NO battery:Rotate the bottom knob to wind up to play music."Outer Wilds"music melody Game theme song,it is a Valentine Gifts for Birthday or Christmas. Windup Music Boxes: Play “Outer Wilds” that doesn't need any battery, This unit plays the 18 note song only while you turn the handle. Vintage design ：This music box is woody. The exquisite surface carved by hand in imitation of ancient times bring you into a magic world. Valentine Gifts: High-quality hand-operated music box toys for kids and adults. The great present anyone could wish for.Thoughtful present for your beloved girlfriend, women, baby, daughter, son, dad, mom, friend on New Year, Christmas, birthday, valentine's day, anniversary to remind her how much you care. Cute and Tiny Music box：the size is 2.55"×2.16"×1.57"（6.5cm×5.5cm×4.0cm) you can put it in your Palm,the music box can bring a wonderful music sound .