General Specifications Size 1-Series 2.75 x 2.6 x 0.9 in. / 7 x 6.65 x 2.4 cm 4-Series 2.75 x 2.6 x 1.2 in. / 7 x 6.65 x 3.0 cm Weight 3.3 oz. / 95g Typical battery life 12 months under normal operation (6 months - 1-Series O2) Certifications and Class I, Div. 1, Gr. A, B, C, D T-Code T4 Approvals Class I, Zone 0 AEX/Ex ia IIC T4 -40 ‹C . Tamb .+60 ‹C ATEX: II 1G Ex ia IIC T4 Ga, 2460 I M1 Ex ia I Ma -40 ‹C . Tamb .+60 ‹C European Conformity IECEx: Ex ia IIC T4 Ga Ex ia I Ma -40 ‹C . Tamb .+60 ‹C