stylus streamlight with 3 aaaa 1.5 batteries. interchangeable atomiser leads, 901s and classic. atomiser leads push on and pull off, batteries last longer than oem batteries, approx. 65 to 80 drawn out puffs, push button manual rear switch, recharegable batteries can be found in duracell 9 volt rechargeable, but initially gives u 3.6 volts, instead of 4.5 with the standard aaaa battery, but even with the lesser power rechargeables, it is sooo much better than the original battery and reliably recharges time and time again. this is what happens when u have nothing else to do.