377 batteries are for use in the Rear Sight Laser (RL-1).
Price:$15.01 (as of the date/time of this post. detailsProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on www.amazon.com at the time of purchase will apply to the purchase of this product.)

392 batteries are for use in the North American arms 22lr and 22mag laser (NAA-1).
Price:$7.99 (as of the date/time of this post. detailsProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on www.amazon.com at the time of purchase will apply to the purchase of this product.)