From the makers of the only genuine Vamo, the KSD S500 by Kangside is a remarkable new device that is tiny in size and huge in power. It's very small at 22 x 40 x 82 mm (0.87” x 1.57” x 3.2”) yet produces 50 watts of power into as low as 0.2? of resistance. The precision resistance meter reads to the hundredth of an ohm. It has an automatically adjusting spring center pin, stainless steel 510 connector and may use eGo threaded devices with the included adapter. Batteries are easily removed for external charging or can be recharged in place by USB with the included micro USB cable. Please do not consider use of low quality batteries with this device. Accessories include eGo adapter, USB charging cable and manual. Features: Variable Voltage or Variable Wattage display modes 7.0 Watts to 50.0 Watts 2.0 Volts to 8.5 Volts Minimum resistance is 0.2 ? Bold and bright display for easy reading under any condition Operation: Use five clicks of the main button to turn it on and off. Use three clicks of the button to switch the main display between voltage and wattage output. Press the up or down power buttons once for each 0.1 incremental change. Press and hold for extremely rapid end to end cycling of 4 to 8 seconds, depending on display mode. Press and hold both power buttons to lock and unlock the power setting. The display shows output voltage and wattage as well as resistance, battery capacity and a timer. Protections include short protection, low resistance protection and reverse battery protection. The S500 comes with Kangside anti-counterfeit protection so you are assured to receive a genuine product. The batteries also come with an authenticity hologram or scratch-off anti-counterfeit verification to ensure they are genuine. Please note this is the upgraded model with the stainless steel 510 connector and battery door. All devices are fully inspected and tested prior to final delivery to ensure a trouble-free buying experience directly from an authorized factory distributor located right here in the Southeastern USA. All products are guaranteed to be genuine. Please read, heed and understand all instructions, warnings and advice included with your package. By purchasing from this store you certify you are age of 18 years or older. All purchasers and users agree to release from liability and to indemnify and hold harmless the seller and associates from any and all liability for accident, injury, loss or damage resulting from use or ownership of any product purchased through this shop.