As someone who provides proposals on a daily basis, although not in this field, This "quote" is a little vague to me.
The words "professional" & "accessories" would alarm me.
Other than the TV there are no specifics. anyone can call anything "professional" and sell it as such.
I want specifics, brand names, models #'s, quantities,
Who is installing this stuff? subcontractors? are they licensed electricians? Do you need permits in your municipality for the electrical?
Work Scope details. There are none.
I realize I may be a bit over the top with MY requirements for a job but, the more information I have or can provide to my potential customer benefits everyone in the end.
When the contractor gives you very little or vague information in his proposal it leaves the door open for them to find "unforeseen circumstances" and bill you without your knowledge.
With a detailed work scope there is no doubt about what is to be done. Anything outside of the original work scope can be mutually negotiated as a change order agreeable to both parties.
No invoice surprises.
Our proposals involve multiple steps, Demolition, disposal, new installation. All materials listed including brand names and quantities, the order and method of installation of the new materials. Standard exclusions are listed, deteriorated decking (replacement is listed on a unit cost basis in dollars per sqft), utility disconnects (by others, owner responsibility), weather, material price volatility over 30 days and so on.
I have won work based on just the proposal I provided, I wasn't low bid. But when the owner is looking at my detailed 3 page proposal and the other contractors 3 paragraph overview proposal for the exact same work, it's not hard for him to decide what he's getting for his money.
Just my nickels worth.