Features: Fine Material: This relay module is made of fine metal material which is thick durable and has a long service life. Lightweight and Portable: This relay module is small in size light in weight easy to store and carry and can be easily taken to any place for use. Fine Craftsmanship: This relay module has very fine craftsmanship high design and manufacturing requirements and high reliability. Utility: This relay module is small solid and durable with optocoupler isolation strong driving ability and stable performance. Function: This relay module has fault-tolerant design. The relay will not work even if the control line is disconnected. The module can set high level or low level trigger through jumper. Specifications: Material: Metal Size: 50mm * 41mm * 18.5mm Max Load: AC 250V/10A+DC 30V/10A Notes: 1. Due to the light and screen setting difference the item's color may be slightly different from the pictures. 2. Please allow slight dimension difference due to different manual measurement. includes: 1 * Relay Module