Check the listing for details. 2PCS 750W Cold Spark Machine Wedding DJ Party Stage Effect Firework Machine. Condition: New. Listed at 408.00 USD. 1.Perfect to use at the Wedding, bodas, stage, events, show, disco, nightclubs, DJ party, fiestas, celebrations, opening/ending ceremony. 2.Effective control distance: 15-20M, super signal receiving module + external gain antenna, signal anti-interference ability is super strong; 3.Control modes Channels: DMX, 16-key remote, master-slave, 3 Channel. 4.The machine is powerful and perfect for stages, weddings, discos, events, celebrations, opening and closing ceremonies, indoor/outdoor occasions. 5.Multiple tests: High and low voltage limit testing, leakage testing, aging testing, etc. Multiple tests provide multiple guarantees for the machine, making your purchase more reassuring. Q: The product can be used indoor safety? A: Our product is safety and can be used indoors with confidence. Q: Can the height of the sparkler be controlled? A: Yes,The height can be controlled by remote,DMX and LCD. Q: What is the sparkler height? A: Adjustable from about 5ft - 16ft. Q: How long can a bag of powder last？ A: About 12 minutes. Q: How many machines can be controlled by a remote control? A: Our remote control has a control range of 20m, and all machines within a radius of 20m can be controlled without an upper limit !