Check the listing for details. Sony 321 Silver Oxide Watch / Electronic Battery 4 Pcs. Condition: New. Listed at 3.89 USD. 4 x Sony/Murata 321 (SR616SW) 1.55V Silver Oxide 0%Hg Mercury Free Watch BatteryPET Blister Packs of 0%Hg Mercury Free 1.55V Silver Oxide CellsExcellent stable discharge characteristics2-3 Year Shelf Life, Made in JapanHigh Energy DensityExcellent leakage resistanceBrand New & Guaranteed Factory Fresh. Provide long shelf life for back up energy purposes together with ideal temperature resistance and superior storage capacity. Works in: Watches, computer motherboards, calculators, PDAs, electronic organizers, garage door openers, toys, games, door chimes, pet collars, LED lights, sporting goods, pedometers, calorie counters, stopwatches and medical devices Equivalent to: 321, SR616SW, D321, V321, V321, SB-AF, 280-73, SR65, GP321, LR65NOTE:Please note that SONY has sold the rights to manufacture these batteries to MURATA. This means that MURATA now makes these batteries rather than Sony. They are the EXACT same batteries, Same Specs, Same Model, and same trusted and dependable batteries, only the name brand has changed and nothing else! Buy with Confidence!