Harmony Secret Senses Black Ying Massager. Find your erotic center. Offer something new to your earthy customers. They will love the Harmony Secret Senses Massagers. Beautiful and incredibly discreet, these little multiple speed vibes are available in black for Yin and white for Yang. Both vibes come with a small velvet-touch container with a Tai Chi symbol accented on the front. These waterproof and travel friendly massagers are the perfect toy for anyone whether a connoisseur or a beginner. Harmony Secret Senses Massagers are made of phthalate free, non-toxic materials ABS plastic. Vibrating sex toy is completely body safe. Vibrator requires 1 AAA battery, not included. Doc Johnson Novelties.