Specifications:

Frequency Range: 50 to 500 Hz
Test Voltage Range: 10-1000V AC
Safety Rating :  CAT II 1000v  
Powered By: 2 x AAA Batteries (Not Included)
Material: ABS Plastic
Color: Yellow & Grey
Item size: 152*23*15mm
Package size: 204*91*19mm
Net weight: 45g
Package weight: 60g

Packing Included:
1 x LED Light Voltage Pen

Features:
The next generation AC non-contact voltage testers are easy to use

Just touch the tip to a terminal strip, outlet, or supply cord.
When the tip glows red and the unit beeps, you know there is voltage present.
Electricians, maintenance, service, safety personnel, and homeowners can quickly test for energized circuits in the workplace or at home.
A perfect tool kit for home and electric industry uses
Ideal design for testing power cables, circuit breakers, wall sockets, junction boxes, fuses, etc
Just press the button, white LED light can be always on when there is absence of voltage
"Beep" sound and red flashing LED would indicate the presence of voltage
Totally insulated, no exposed metal or conductive parts
Long life and low power consumption
Compact, safety, & easy to carry

Single Beep = Turned ON, test current 

Double Beep = Turned OFF, no current will be detected