Do I have to install optical sensors (STB's)? Are there any special instructions regarding placement?

Yes… it is required. As of January 1, 1993, the federal government mandated the use of these entrapment protection systems on all garage door openers sold in the United States. The opener will not close the door if the Safe-T-Beams are not installed. Please remember… the garage door is typically the largest moving object in the home. These devices are intended to minimize the potential for property damage…and more importantly, minimize personal injury.

The STB lens should be 4” to 6” above the garage floor!