That's exactly right. One other thing to note is that with the receiver is that we qoute 40 hours of continous use, but we're got on our field testing when we did it a year or two ago 60-80 hours of time. Cray is right though blink once every second for a good charge and blinks every 4-5 seconds for a low charge.Cray Stephenson said:If the collar charge is 'good' then the light blinks once every second. If it needs recharging, then it blinks once about every 4 seconds. The Transmitter is a little different, when you hit a button, the light comes on and remains on when the charge is 'good' (as long as you hold the button) if it needs to be recharged, it blinks when you hold the button.