This is a Kyocera CX3225GB16000D0PRTC1, 16V, 2000F, 5.6mm L x 31.9mm D (including terminals), super capacitor. It offers a wide operating temperature range from –20°C to +65°C, has a low ESR and is designed for reliable, long-term operation. This part is non-flammable, is halogen-free, and is RoHS compliant.