SONOFF SPM-Main 4Relay Stackable Power Relay Module DIY MINI WIFI Smart Switch 20A EWeLink Alexa Google APP Control SD C

Description 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 Specifications 1 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 2 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 3 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