Note before Order: 1. It's high Amp item, and the device needs certified and professional electrician for wiring. 2.The frequency of the wireless router is 2.4GHz. 3. To have the daily weekly monthly power consumption record, you must upgrade the application to the latest version above version 3.35.0 4. The meter requires the measured device must have neutral wire. otherwise it can't measure the device's voltage, current, and power Clamp Diameter<br><br>note: When you install the CT , please note the CT's direction, make sure all 3 CT with the same direction. Please follow the 's direction type: 120A Material: plastic colour: white<br><br>Package Contents: 1 x KWH meter 3 x collars<br><br>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.