These atomisers come without primer; please prime with 4-5 drops of e-liquid and leave the liquid 30-60 seconds to soak in and wet the coil, before first use. Use with drip tip recommended. Low Resistance (LR) Atomisers: these are for the people that want to experience higher voltage vaping without the use of stacking batteries. Do not use these atomisers on power sources greater than 3.7v. The manufacturers state that LR atomisers have a shorter life expectancy than normal atomizers. Therefore they come without warranty, but are guaranteed to be in working order upon arrival. Please check all LR atomizers upon receipt to ensure that they are in working order. PLEASE NOTE: USE OF LOW RESISTANCE ATOMISERS IS ONLY FOR BATTERIES OVER 450mAh. DO NOT USE ON REGULAR ECIG BATTERIES.