Q:Could you provide a sample for me to test first?
A:Yes, sample is available, but the freight is your responsibility.
Q: What certificates you have?
A:We have CE,ROHS,ISO9001:2008. IP68, IP67, IP55, IP57, IP54, VW-1, FIRE-PROOF, ATEX, LOW TEMPERTURE, UN38.3....
Q: What's your warranty?
A:Our warranty for Battery and charger is 12months, Earphone 6months
Q: Do battery need charge at the first time
A: Charging is needed. For Ni-Cd,the first charging should over night. Ni-Mh and Li-ion can stop charge when the light green.