About this item

• Adjustable stroke from 2.5mm to 4.5mm, no limits between it.
• 18500 Lithium-ion Battery with circuit protect which protects the circuit board and incorrect battery installation.
• High-definition OLED screen that shows voltage, hertz, timing and power display.
• Anti-slip grip
• Comes with 2 rechargeable batteries so you can use one in session and charge the other!