A type of external sex toy that combines rhythmic rolling motion with vibration for targeted stimulation. It’s primarily designed for use on sensitive erogenous zones such as the clitoris, perineum, nipples, or inner thighs. Below are its defining characteristics:

1. Rotating Bead Design

• Features 3–7 smooth, rotating beads embedded along the stimulation head. These beads may spin freely or be motor-driven.
• Materials commonly include ABS plastic, silicone-coated metal, or full-body medical-grade silicone.
• The rolling action delivers continuous, pinpoint pressure that mimics fingertip massage or kneading.

2. Multi-Mode Vibration

• Equipped with a quiet internal motor offering multiple intensity levels and patterns (e.g., pulse, wave, escalation, random).
• Vibration and bead rotation often work in synergy to create layered, dynamic sensations.

3. Ergonomic & Compact Form

• Slim, easy-to-grip handle with a contoured head that follows natural body curves for precise targeting.
• Typically compact (10–15 cm / 4–6 inches in length), making it discreet and ideal for one-handed use.

4. Quiet Operation & Portability

• Low-noise motor ensures discreet use (usually under 50 dB).
• Powered by USB rechargeable batteries or button cells, with typical run times of 60–120 minutes per charge.

5. Body-Safe Materials & Waterproofing

• Contact surfaces made from medical-grade silicone or ABS/silicone blends, free from phthalates and compliant with safety standards (e.g., CE, RoHS).
• Most models are fully waterproof (IPX7 rated), allowing thorough rinsing and safe use in the shower.

6. External-Use Focus

• Designed specifically for external stimulation—ideal for the clitoris, labia, perineum, nipples, or other sensitive areas.
• Not intended for vaginal or anal insertion unless explicitly labeled as dual-purpose by the manufacturer.
• Also popular as a couple’s toy for foreplay or sensual massage.

7. Simple & Intuitive Controls

• Usually features 1–2 buttons for power and mode cycling—user-friendly and straightforward.
• Premium versions may include magnetic charging, memory function, or Bluetooth app control.