Product Review

AT-211D is water-resistant, pls DO NOT make your dog swim with it. Otherwise, it may cause to messy code with beeps, vibrates or shocks continuously. The receiver is small, so does the battery. Normally, the receiver last one day after one fully charge.Aetertek AT-211D Features
Can be used as 1 dog or 2 dog training system, this list is for 2 dogs training;
LCD display remote for easy control, very convenient;
Warning beep, vibration and 10 levels of shock;
Rechargeable remote control and receiver collar;
Solid remote range of up to 400 yards;
Suitable for healthy dogs from 6 to 50 pounds dogs;
Brand new in box;

About the Receiver
Static shock feature at the highest intensity is adequate for dogs up to 50 lbs. Mildest shock will not harm even the smallest dogs;
Rechargeable with a built-in long lasting battery for consistent power supply;
Low battery indicator;
Strap adjustable from 3.75" to 12.5" long;

Specifications:
Strap color: Orange or Black(at random)
Strap total length: Approx. 32.5cm / 13.0in
Transmitter size: 8.3 * 3.7 * 1.3cm / 3.3 * 1.5 * 0.5in
Transmitter weight: 30g / 1.1oz
Small receiver size: 5.0 * 3.125 * 3.125cm / 2 * 1.25 * 1.25in
Small receiver weight: 1.1oz

Package Contents:

For 2 dogs training system

1 transmitter (battery included);
2 collar receivers
2 TPU dog strap (color can be various);
1 Test bulb and wall charger
4 contact points;
1 User's manual