Aimshot's modular battery pack is an upgrade for your aimshot 223 laser bore sights.Instead of using the 3 small watch batteries, this allows you to upgrade to the external battery pack that utilizes two aaa batteries and will run the red laser for 20+ hours.It is also a replacement in case something happens to your existing bsb223 laser bore sight.Fits all aimshot and speedaim 223 laser bore sight models.It will not fit the green 223 laser models.Rechargeable: NoNominal Voltage: 3vRated Capacity Mah: N/AConfiguration: Power PackCharge Time: N/AStyle: Power PackQuantity: 1Hazair: Yes