Noisy Cricket II-25 mod is made of high quality stainless steel and comes with unique design. This new version Cricket II-25 mod supports optional circuit in series and parallel. Simply turnover the circuit board, you can choose the series or parallel circuit to your preference.Under cells in series circuit condition, two modes are available: Direct Output mode and Constant Voltage Output mode.With dual replaceable 18650 batteries, it is more convenient for users.