Rimba Electro Play bipolar large bullet or egg for anal and vaginal use. The lead wire is the pull back cord as well. When both metal parts divided by the black ring are touching the human body, a shock can be applied. Always be careful, do not use if skin is broken or iritated, when you have heart problems or are pregnant. Tip: use rimba contact gel ref # 3000 toexperience the best results. The sound has a 2,5 mm jack plug that connects directly to all Rimba Power Box devices. This item is available in 2 sizes # 7859 is Small (25 x 60 mm) and # 7860 is large ( 35 x 70 mm)