1、The dual Bluetooth relay module includes 2 12V/10A relay modules and SPP‑C Bluetooth serial D slave module, which can be used to control the switch of the relay by sending instructions through the mobile phone APP 2、Can be used continuously for 100,000 times, with diode discharge protection in a short time 3、The relay module has bluetooth status indicator and relay indicator, easy and convenient to use 4、Reserve UART debugging interface and STM8 SWIM program download interface for easy connection 5、Adopted of high quality electronic components, and accuracy process, ensure for the durability Item Type: Bluetooth Relay Module Material: Plastic Control Distance: Approx. 10meters / 32.8ft (open environment) Reserved UART debugging interface and STM8 SWIM program download interface 1 x Relay Module