Features:  - T-shaped Integrated Structure: Strong sense of science and technology, sweat-proof and anti-slip.  - Wireless & Compact: Easy to carry, so you can also use it when travelling.  - Aerospace-grade Aluminum Alloy Shell: Frosted anode surface treatment, textured & durable.  - High Torque Brushless Motor: Stronger power, lower wear, more effective noise reduction and longer service life.  - Dual Bearing Transmission Design: Enhancing the stability of the massager & more silent.  - 10-minute Intelligent Power-off Protection: Based on the AI intelligent chip, the high performance configuration can quickly respond to processing instructions and automatically power off after 10 minutes, effectively preventing overload, short circuit, overshoot and other problems, safe & professional.  - 4 Adjustable Variable Speed: Efficient massage to relax muscles and relieve pain.  - Equipped with 4 Detachable Massage Heads: Massage accurately to relax the muscles, including spherical massage head, u-shaped massage head, cylindrical massage head and flat massage head.  - Long Endurance Time: 2200mAh lithium battery, with continuous endurance up to 240 minutes.  - Power Indication: Charging state(red light), sufficient power state(green light). When the power is sufficient, the power indicators flash three times every 5 seconds; when the power is less than 60%, the power indicators flash twice every 5 seconds; when the power is less than 30%, the power indicators flash once every 5 seconds.  - Wide Application: This massager can effectively relieve and alleviate the backache, muscle soreness and joint pain after finishing housework, exercise or a day's work.    Specifications:  Material: Aluminum alloy + PC + electronic components  Color: Black / Red / Gray (Optional)  Battery Capacity: 2200mAh  Charging Time: 2.5-3 hours  Endurance Time: About 4 hours  Battery Indicator: Normal (green); Charging (red)  DC Input: 24V / 1A  Rated Voltage:12V  Rated Current: 2A  Rated Power: 20W  Vibration Frequency: 50-60Hz  Operating Environment: -10-40℃  Massage Gear: 1-4 (adjustable)  Motor Speed:   Gear-1: 1600rpm/min  Gear-2: 2100rpm/min  Gear-3: 2700rpm/min  Gear-4: 3200rpm/min  Item Size: Approx. 9*4.5*14cm / 3.54*1.77*5.51in  Item Weight: Approx. 513g / 18.1oz  Package Size: Approx. 22*18*7cm / 8.66*7.09*2.76in  Package Weight: Approx. 788g / 27.8oz    Note:  1. Do not touch or press the massage head during operation.  2. Do not continue to use on the same part of the body for a long time.  3. If you feel unwell, please stop using immediately.  4. Infants, minors, pregnant women, people with fracture, pacemaker or metal contents in the body should not use this product.  5. Please keep the power off when charging.