Alkaline LR6 AA x 4 (not included). We are willing to respond to your inquiry.If you are not satisfied with our product or service, please communicate with us before leaving us any feedbacks. We will do our best to help you solve the problem for your satisfaction. The item "Fingerprint Doorlock Gateman Z10-IH Keyless Lock Smart Digital Biometric Entry" is in sale since Thursday, February 23, 2017. This item is in the category "Home & Garden\Home Improvement\Building & Hardware\Doors & Door Hardware\Other Door Hardware". The seller is "force-k" and is located in Seoul, Seoul. This item can be shipped worldwide.