Ooze Duet Dual Cart Battery Replacement BaseThe Ooze Duet is a 510 thread battery with a magnetic base that can hold two oil cartridges at once. This is the replacement magnetic base to keep a Duet device working properly. It features an IntelliSwitch on the bottom to indicate if the left, right, or both 510 threads will be used. Use the airflow switch to control the airflow of each thread. Available in 4 colors. PRODUCT FEATURES: Dualflex 510 Thread 2 Threads Allow for 2 Cartridges at Once