This 100% silicone vibrator is completely harness compatible with a removable Variable Speed Micro-Mini Vibe, which fits perfectly in the base. Silicone is a very dense material and carries vibrations very strongly all the way up the shaft to the tip of the top head. Echo is safe for anal or vaginal play. Because it's silicone it's flexible, warms to body heat, hypoallergenic and hygienic (boilable and bleachable in a 10% solution). The silicone dildo should be separated from the battery vibrator before cleaning. Micro-Mini Vibe uses 3 watch batteries (included), remove plastic dot under vibrator cap in order to start.