At first, we should know what is the tamper proof function ？
understanding smoke detector features. … Battery-powered units run on 9-volt or AA batteries, or a long-life lithium battery that may be sealed inside the alarm so the battery is non-replaceable. This feature is referred to as tamper-proof.
So about 10 year tamper proof smoke detectors，meaning that a smoke detector with built-in 10-year 3-volt lithium power cell（of course, also including 9-volt or AA lithium batteries） ; photoelectric sensor for efficient smoke detection; Tamperproof design prevents batteries from being. you can choice our SR-825PHS 10 year tamper proof smoke detectors.
This 10 year tamper proof smoke detectors has 3V non-removable Lithium power cells sealed into the battery pack. This makes the unit tamper-proof. Once the batteries are installed in the detector, they are activated. They provide up to 10 years of continuous service. Since they are power cells – not traditional batteries – they cannot be used in other battery-powered devices, which deters unauthorized removal. Once the power cells become weak, the smoke alarm must be replaced. you should atten this point ！
Some manufacturer offer long-life Lithium batteries, which provide a longer service life than carbon zinc or alkaline batteries, It is notable that 10 year tamper proof smoke detectors can use life up to 10 years ,aslo depending on type of alarm, temperature conditions over the life of the alarm, how often the unit is in alarm, how often tested, etcetera.