Feature: 1. Industrial grade products, resistant to falling and waterproof, oil resistance and acid resistance, don't worry that sweat and oil will affect the product. 2. Suitable for cranes, conveyors, coal mining equipment, concrete pumps and other mechanical equipment. 3. With 800MHz transmission frequency and good anti-interference ability. 4. The performance is stable and reliable, meeting the industrial stability requirements. 5. The products are rigorously tested before leaving the factory to meet the stringent requirements of working in harsh environments.