Yes, they have 3 buttons. T20 has beep, vibrate and turn collar light on/off.
Tt25 has those features as well as being ecollar. Range is limited to about 10km between collar and hand set in good conditions. Less in thick bush and maybe a little more if one of you is higher than the other. New collars have much better battery life.
As i said its more about piece of mind.
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