"This come with batteries AAA; set up is 10seconds and you are ready to go. Test it on live circuit to make sure it detects correctly - just a prereq. Good quality. Provides visual and sound alerts. Glad I have bought it. Good reviews. Can't say much about reliability, as just bought it."
"Great little bit of kit for the price, clear lighting and good sound to indicate live wiring. Worth having to keep to hand in your pocket...would recommend just as much as more expensive models I've used...good buy!"