Casio Watch Line: ProTrek
Battery type: SR927W x 4
Battery price: 2-5$ [Ebay + Free Shipping Worldwide]
Battery price: $3.14 [Aliexpress + Free Shipping Worldwide]
Original Battery for: ProTrek SPF-40 Watch
Compatiable with models: PAG-40SPF-40PRG-280

Casio-SPF40-Band

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