Digiflavor launched a new Siren atomizer: Digiflavor Siren MTL RTA V4.

Single-coil Two-post GTA Design Deck
GTA deck design prevents liquid from leaking and spitting and allows the airflow to come up straight under the coil. 
Single-coil two-post style deck enables an easy coil-building.

Built for DIY
Digiflavor Siren MTL V4 includes 4 kinds of MTL coils: φ2.0(MTL Ni80 Clapton 1.2ohm Coil/ MTL Ni80 Fused Clapton 1.4ohm Coil)
φ2.5(KA1 Braided 0.65ohm Coil/ MTL SS316 Fused Clapton 1.0ohm Coil)

Semi-hidden AFC Airflow Control with Center-located Honeycomb-style Airflow Holes
Bottom Semi-hidden AFC structure, slide-to-adjust linear airflow setting, anti-liquid-spilling
Center-located honeycomb-style airflow holes, the air to flow straight to the coil

Convenient Top Filling, Long or Short 510 Drip Tips

You can know more about Digiflavor Siren from below chart.

Digiflavor Siren GTA Digiflavor Siren V2 MTL GTA Digiflavor Siren MTL RTA V4
Diameter 22/25mm 22/24mm 22mm
Height 43mm 44mm 51mm
Capacity 4ml/5ml 2ml/4ml 2ml
Configuration single coil single coil single coil
Airflow Bottom adjustable airflow system Adjustable bottom airflow system leakproof bottom airflow adjustable system