{"product_id":"dc-12v-8-channel-bluetooth-relay-module-smart-home-led","title":"DC 12V 8-Channel Bluetooth Relay Module for Smart Home Control","description":"\n\u003ch2\u003eDC 12V 8-Channel Bluetooth Relay Module — Wireless Smart Home Control\u003c\/h2\u003e\n\u003cp\u003eTake full command of your smart home setup with the \u003cstrong\u003eBT21A08 DC 12V 8-Channel Bluetooth Relay Module\u003c\/strong\u003e. Designed for seamless wireless integration, this relay controller lets you switch lights, LED strips, appliances, and more directly from your Android smartphone — no complicated wiring or hub required. Made in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e8 Independent Relay Channels\u003c\/strong\u003e — control up to 8 separate circuits from one compact module\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBluetooth 2.1 Wireless Control\u003c\/strong\u003e — operate via the included Bluetooth app or integrate with your own custom app using simple serial commands\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Control Voltage Range\u003c\/strong\u003e — supports AC 85–265V \/ 10A and DC 1–110V \/ 10A, making it compatible with most home electrical systems\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlexible Relay Modes\u003c\/strong\u003e — supports momentary (point), self-locking, and interlock modes; each relay features normally-open (NO) and normally-closed (NC) contacts\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCustomizable Bluetooth Settings\u003c\/strong\u003e — rename the Bluetooth device and change the connection password via AT commands for added security\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Lightweight\u003c\/strong\u003e — measures just 96 × 68 × 19 mm and weighs approximately 117 g, ideal for panel mounting or enclosure integration\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWireless Range\u003c\/strong\u003e — reliable communication up to 6–10 meters depending on environment\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBT21A08\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 12V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandby Current (all relays off)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCurrent per relay \"ON\"\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~28 mA per additional relay channel\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax current (all 8 relays ON)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e229 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCommunication Mode\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBluetooth 2.1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCommunication Distance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6–10 meters\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eControl Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAC 85–265V \/ 10A; DC 1–110V \/ 10A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDefault Bluetooth Password\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1234\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e96 × 68 × 19 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~117 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× BT21A08 8-Channel Bluetooth Relay Module\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDue to monitor and lighting differences, the actual item color may vary slightly from product images.\u003c\/li\u003e\n  \u003cli\u003ePlease allow a tolerance of 1–3 cm due to manual measurement.\u003c\/li\u003e\n  \u003cli\u003eThis module operates at low voltage (DC 12V input); however, relay output terminals may carry high-voltage loads — always follow proper electrical safety practices during installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor general electrical safety guidelines, visit the U.S. Consumer Product Safety Commission — Electrical Safety.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Is the BT21A08 Bluetooth relay module compatible with iOS devices?\u003c\/h4\u003e\n\u003cp\u003eA: The BT21A08 uses Bluetooth 2.1 (Classic Bluetooth) and is primarily designed for Android smartphones. Most iOS devices require Bluetooth Low Energy (BLE) for third-party app connectivity, so iOS compatibility is limited. For best results, use an Android device with the provided app.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I control the 8-channel relay module with my own custom Android app?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The module accepts simple serial commands over Bluetooth, so you can integrate it into your own custom Android application. The provided app is a great starting point, but developers can send their own command strings to control each relay channel independently.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What types of devices can I control with this relay module?\u003c\/h4\u003e\n\u003cp\u003eA: This module is ideal for controlling LED lighting strips, standard light fixtures, small appliances, fans, and other loads within its rated capacity (AC 85–265V \/ 10A or DC 1–110V \/ 10A per channel). It's a popular choice for DIY smart home automation projects.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I change the Bluetooth device name or password?\u003c\/h4\u003e\n\u003cp\u003eA: You can modify the Bluetooth name and connection password using AT commands sent through a serial terminal or your app's serial interface. Detailed instructions are included in the Bluetooth Parameter Modification guide that accompanies the module.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Is the BT21A08 Bluetooth relay module compatible with iOS devices?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The BT21A08 uses Bluetooth 2.1 (Classic Bluetooth) and is primarily designed for Android smartphones. Most iOS devices require Bluetooth Low Energy (BLE) for third-party app connectivity, so iOS compatibility is limited. 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