Check the listing for details. SONOFF Wifi Smart Stackable Power Consumption Metering RS-485 Relay Switch. Color: White, Condition: New. Listed at 39.99 USD. Store Categories Store Categories eWeLink-Item WIFI Smart DIY Switch WIFI Smart Wall Switch WIFI Smart Socket Plug Zigbee Series SONOFF-Item Zigbee Series WiFi Smart Switches Wi-Fi Smart Lighting WIFI Smart Plugs WiFi Smart Wall Switches SONOFF Outlet Other SONOFF Wifi Smart Stackable Power Consumption Metering RS-485 Relay Switch Remote Product Description Description: SONOFF Stackable Power Meter realizes smart management with overload protection, metadata monitoring and electricity statistics.The SPM-Main communicates with the cloud through Ethernet or WiFi, and communicates with the SPM-4Relays through RS-485, which allows for multi-terminal and stable long-distance data transmission. Want to know the power consumption changes of each stall? Want to realize the unified management of the whole shopping mall? By checking eWeLink App on your mobile phone, you can monitor the electricity usage without leaving home. Through the eWeLink App, you can obtain the power consumption through a touch. Once the overload protection is enabled, you do not need to worry about electrical appliances being burned out, which helps remove potential safety hazards. In addition, you can also set the overload delay activated to avoid spurious triggering.One SPM-Main can be connected 32SPM-4Relays. Each SPM-4Relay has 4 isolated channels to help the tenant to solve the problem in electric charge sharing. Each channel can support maximum current of 20A, no fear of high power load. Get Over 180-day of Energy Usage Data Available SD card local storage. You can insert the SD card into SPM-Main to download and check over 180 days of your energy usage history at any time of the day through HTTP API. No need to worry about missing the important information. Features: 【Connect up to 32 SPM-4Relays】One SPM-Main can be connected 32 SPM-4Relays. Each SPM-4Relay has 4 isolated channels to help you manage devices more conveniently. 【Power metering】You can monitor the power consumption by checking eWeLink App on your mobile phone. Obtaining current, voltage and power easily. 【Max. 20A/Gang】Each channel can support maximum current of 20A, no fear of high power load. 【Communicated by RS-485】The SPM-Main communicates with the SPM-4Relays through RS-485, which allows for multi-terminal and stable long-distance data transmission. 【Overload Protection】Once the overload protection is enabled, it can protect your devices from burning out. Note : The Main Unit and 4-Relay of the Stackable Power Meter need to be used together. The Main Unit is connected to at least one 4-Relay to function. Package includes : 1 * Main Unit/4-Relay 1* 50cm RVVSP 1 * User Manual Payment Policy Shipping Policy Returns Policy Feedback About US Payment Policy We accept payment via Paypal only. Please settle the payment via PayPal within 3 days upon auction ended. You can left us a message about your special request. Shipping Policy Packages will be sent out with 24-48 hours (except holidays). Packages are only shipped via Paypal Address. We will not bear for duties or taxes. We offer free shipment via Economic method.we also offer express transportation,while you need to pay for the extra postage. If you have not received your items within 30 days,please contact us trough Ebay message,please contact us before you contact ebay. Returns Policy We accept returning with 30-days,please add your ebay ID into the package. You can receive the replacement or money back. Feedback We will appreciate for your positive feedbacks,if you have any questions,please Contact us firstly we will try our best to help you. Emails will be replied with 12 hours,replies will be delayed in holidays. About US Working time:Beijing Time From 9:00am to 6:00pm,from Monday to Friday. (we don’t work on weekends).we will get back to soon on working time. Copyright © 2021 Dianxiaomi