1/2 AA size lithium Thionyl Chloride cylindrical cell high energy, high reliability 3. Compatible with Snuza Hero/ Snuza go (Not fit for Snuza Hero SE and go SE model ). Compatible with DogWatch SmartCollar, R9, R9V, R8, R12, R3000, AR300 and most other older receiver models; typically lasts 2 years in R9 and R8 receivers, 1 year in the R9V and SmartFence, and 1 year in older receiver models.
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