Replace your older mercuric oxide TR-165 or E164 battery with the efficient and long-lasting Exell A165 7.5v Alkaline Battery (EN165A, PC165A, TR165A). This alkaline battery is used in specialist applications such as in the MK-328 spy radio. It is also utilized in various applications such as photography, pagers, electronic instruments, and various testing equipment. The battery produces 7.5 V, which is larger than the 6.8 V produced by the TR-165. Although the voltage is higher in this battery, most devices will easily accommodate the increase and still function properly. The Exell A165 7.5v Alkaline Battery (EN165A, PC165A, TR165A) offers excellent reliability and enduring performance.