Easy do-it-yourself radio coding of the collar with the remote control: you can code the collar indefinitely, either with the same remote control, or with a new one from the REMOTE TRAINER EYENIMAL range. Includes warning beep sounds, low battery indicator on the collar, and low battery indicator on the remote control. Remote control is waterproof. Remote control: waterproof, battery life: 30 000 triggers. Receiver collar: waterproof, battery life: approx. 7 months in stand by, approx. 2 months in intensive use. No external antenna on the collar. Compatible with DogTek brand remote trainers Strap: collar adjustable to neck sizes from 8” to 21.5” Receiver collar power: 1 3-V CR2 lithium battery (supplied) Receiver collar dimensions: 2.6” x 1.5” x 1.6” Receiver collar: weight: 2.6 oz (without strap)