Dive Alert Plus v2 Models Available for Almost All Inflators and Breathable/Inflators Extremely Load (132db) On Surface Signal with a Touch of a Button Dual Signal Above and Below the Surface Works with As-Little-As 100psi (6.9 bars) Lightweight Design Increased Dive Safety Up to One Mile (1.61 km) Surface Audible Range Easy to Install Injection Molded Thermoplastic, Chromed Brass and Stainless Steel Construction Owner’s Manual Dive Alert Plus v2 Specifications: Type (Pneumatic/Manual): Pneumatic (BCD Inflator Hose) Activation: Push Button dB Rating: 132dB Audible Range: 1 Mile (1.6 km) Materials: Body: Injection Molded Thermoplastic, Chrome Plated Brass, Stainless Steel Purpose: Audible Surface Signaling Device Compatibility: DV1: All Standard Inflators