Rechargeable: 500 mAh. 10min/day, lasts 10 days. Slipping it into pocket / handbag / backpacks, the acupuncture pen relief pain for acute and chronic conditions including arthritis, muscle soreness, joint stiffness, and back pain. Engineered for portable pain relief your on-the-go therapy companion.20 INTENSITY: Please start at low intensity and gradually increase according to your tolerance. Applying thin gel/water on the massage area can enhance the conductivity and improve the treatment experience.Manufacturer Warning: Do not use during menstruation and pregnancy. Not for use with implanted electronic devices such as pacemakers.3 MODE: 1) Ripple wave (50 Hz): Targets the outer skin Layers, proving a gentle stimulation; 2) Intermittent wave (10 Hz): Focus on slightly deeper layers, it delivers targeted relief for the localized areas; 3) Continuous wave (4 Hz): Reach deeper tissues. It offers deeper stimulation for enhanced therapeutic effects.Package listing: Acupuncture pen with big probe head, Small probe head, Conductive rod, USB charging cable and Manual; Product weight: 0.23 lb, Package weight: 0.78 lb. Dimensions: 10.3x4.2x1.8 in.