For most dogs, it needs 7 to 14 days to take effect; for few dogs, it needs 4 to 6 weeks to take effect; for very few dogs, it needs longer time to take effect

Power: 2 / 3 AA battery

Dimensions: 80 x 48 x 43 mm

Adjustable strap: approx. 25 - 50 cm

Deal price: $ 6.99

If you want to buy in large quantity, there will be very nice discount for you. Just visit b2c-support.com and see what you need.

http://www.b2c-support.com/dogs-anti-barking-shock-training-control-collar-trainer-p-3337.html