Feature: 1. Good Relay Control: Adopting 4 relay control circuits, standard design, standard manufacturing, reliable and safe electrical performance. 2. High in Safety: The motor is equipped with a 110 ℃ thermal protection function, which automatically shuts down for protection in case of overload. When the machine temperature drops to 70 ℃, normal operation can be resumed. 3. Stable Operation: Smooth and reliable braking, accurate positioning of travel limit control. Equipped with dual limit protection and chain breaking anti fall protection devices to prevent the rolling door from hitting the top. 4. Simple Maintenance: The rolling door machine is equipped with manual and electric automatic switching devices, which can be manually opened and closed during power outage, maintenance, and adjustment. 5. Excellent Design: Powerful, stable operation, light weight, low noise, and low energy consumption. Easy to install and debug, compact and pretty design, stable quality, reliable and durable. Specification: Item Type: Wireless Remote Control Switch Remote Control Power Supply: Built in 23A 12V lithium battery with 50mAh capacity. Remote Control Distance: Approx. 15m / 49.21ft. Package List: 1 x Wireless Remote Control Switch 2 x Connecting Cable2 x Remote Control1 x Iron Piece2 x Remote Control Hanging Ring