【Brand and Model Number】 ELPA's ARA-02RC is a reliable security device, specifically designed as a remote control for the ARA-02. 【Features and Convenience】 This remote control allows for the addition of up to 40 units, enabling centralized management of multiple security devices. Its easy-to-use, handheld operation provides peace of mind. 【Battery and Usage】 One CR2032 lithium battery is included, making it ready for immediate use. The included test battery allows for immediate operational checks after purchase. - Brand: ELPA - Model Number: ARA-02RC - Purpose: Dedicated remote control for ARA-02 - Function: Additional remote control - Maximum Addable Units: Up to 40 units - Battery: 1 x CR2032 lithium battery (test battery included) The ELPA ARA-02RC is an additional remote control exclusively for the remote-controlled door alarm "ARA-02". It cannot be used without the main unit "ARA-02". Up to 40 units can be added, allowing all family members to have a remote control. The remote control's ID code has over 1 million combinations, so there is no need to worry about interference. It uses one CR2032 lithium battery (test battery included). Thank you for looking.