1. Make sure that the tip of the needle is upright and no objects touch.the button of the power supply have a line ,it's the ground wire . Please do not connect with the ground wire to the plate ,it's too close will be arcing leading to burn, please kindly know it . 2. Do not touch the tip of the needle with any objects,when it's work. 3. In order to prolong the service life of the product, use it with a fan, and the continuous working time should not exceed 1 hour. It is recommended to use it intermittently, that is, work for 1 hour and rest for 5-10 minutes. 4. Use environment: temperature should not exceed 30, humidity should not exceed 80% Power:Less than 10-15W Input voltage:AC220V-50HZ/60HZ, Output voltage:DC-15KV0.5KV Negative ion concentration:200 million/cm Power cable length:about 1.2m Note:Do not touch the high-voltage end Plug Type:EU Plug,it applies to Indonesia, Germany, France, , Italy and so on. Colour:As Shown Material:plastic+Metal Package Contents: 1 * Negative Ionizer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.