【Rechargeable & 3.5-Hour Runtime】 The 12-Gauge bore sight laser includes high-capacity batteries that deliver stable, long-lasting power for an ultra-straight laser beam. Utilizing upgraded battery technology, the 12 GA laser bore sight operates continuously for 3.5 hours - ideal for enthusiasts with Shotgun. 【Convenient Push On/Off Switch】 Featuring a sensitive push-button switch, this design enables instant laser activation/deactivation with a single press. The intuitive control allows users to power off the device during storage without battery removal, eliminating accidental drain while ensuring constant range readiness. 【High Accuracy 12 Gauge Bore Sight Laser】 This precision laser boresighter is engineered exclusively for 12GA Shotgun, featuring a caliber-specific design that ensures perfect chamber alignment. The 12 Gauge bore sight achieves targeting ranges of 15-100 yards in low-light conditions, enabling faster shotgun zeroing with reduced ammunition expenditure. Class IIIA laser, less than 5mW. 【Portable Protective Case】 Included is a rugged tin case designed for portability during outdoor activities or range visits. This durable case provides optimal protection for your 12GA laser boresighter, preventing damage during transport. 【Sturdy Aluminum Alloy Construction】 Crafted from robust aluminum alloy, the CVLIFE 12 Gauge laser bore sighter delivers exceptional barrel protection against scratches.