<b>NOTE:For the first use, you need to install two AAA batteries (Need to buy it yourself).If the lock box is closed or locked before the battery is installed, please connect the charging cable (included in the accessory). When the screen is on, press and hold (H, M) for emergency unlocking. In addition, the product does not have the charging function Do not charge it, it may cause damage to the lock box.If you encounter other problems during use, please contact the seller.</b>