Feature:1. Built-in 2600mah large-capacity lithium battery, charge for 90 minutes, can be used for 4 hours. 2. The wheelbase can be adjusted by fine-tuning the nozzle to bring about a deeper impact. Output times are unlimited. 3. Upgraded smart chip, 5 frequencies, 18 gears adjustable (low frequency, medium frequency, high frequency, over frequency, frequency conversion 50N-900N, each gear increase of 50N). 4. Display screen, power display. Language switches (Chinese and English). 5. Equipped with 5 heads to meet different needs. Significant and good effect. Specification:Condition: 100% Brand New Item Type: Bone Correction Massager Material: ABS + Metal Plug: US Voltage: 100-240V Size: Approx. 24 x 22cm / 9.4 x 8.7in (after install the massage head) Battery Capacity: 2600mah Massage Head: 5pcs Working Head Stroke: The original stroke is 5mm / 0.2in, and the adjustable stroke is 17.5mm / 0.69in-maximum 22.5mm / 0.89in Strength: 50N - 900N Frequency: 50/60HZ Charging Time: 90 Minutes Usage Time: 4 Hours Package List:1 x Bone Correction Massager5 x Stainless Steel Head 5 x Silicone Head 1 x Bag of Silicone Cover 1 x Charger