size:170mm*40mm 100PCS/CTN, CTN MEAS: 46*24*39.5CM; 1.only Shake it forward and backward while use .so as to make it generating to light up 2.its switch system is based on advanced magnetic induction technologies so its long in service life and reliable in performance ADVANTAGES: 1;A torch is used for emergency lighting purpose .however ,the tradition battery-supplied torch may cause you a big trouble because the battries will become ineffective and produce pollution if the torch is left idle for a long time .the chargeable torch also has the problem of power leakage:or it will help you remember to charge only at the time you need .this innovative torch is the breakthrough in solution to wast and inconvenience.