Write SQL query to solve given problem: How many female users use ZenFone 5 devices?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT COUNT(T1.gender) FROM gender_age AS T1 INNER JOIN phone_brand_device_model2 AS T2 ON T2.device_id = T1.device_id WHERE T1.gender = 'F' AND T2.device_model = 'ZenFone 5'