Feature:1. 8 CHANNEL RELAY: The on board 8 channels relay module can be activated continuously for 100,000 times and have a long service life.2. SHORT RESPONSE TIME: Equipped with diode effusion protection, this relay has short response time to ensure real time remote control.3. 10 METERS DISTANCE: When carried on the cell phone, the maximum stable transmission distance can get to 10 meters, very convenient.4. PRACTICAL USING: Used to send instructions through the mobile phone and control the switch of the relay on electronic equipment.5. EASY CONNECTION: Reserved UART debugging interface and MCU program download port add more convenience to the connection.Specification:Item Type: Relay ModuleMaterial: Printed Circuit BoardWorking Voltage: DC7-28V/DC 5VRelay Module Specification: 8 Channel Maximum Stable Transmission Distance: Approx. 10meter / 32.8ftFunction: Send instructions through the mobile phone to control the switch of the relay. Applicable Scenarios: Intelligent control, electronic equipment. .Package List:1 x Relay ModuleNote:1. Do not use the product in an electrostatic environment, which will damage the electronic components of the product; 2. When the mobile phone is mounted on the module, the maximum stable transmission distance is 10 meters; 3. Currently the module only supports for Android system, doesn't support for IOS.