This little beeping sound is pretty strange. I have three tamas with the beep, and two without the beep. All of them are Connexions.
My 2nd V1, V2 and V3 have the heartbeep. But the V4 and the 1st V1 don't have any heartbeep - and their batteries last much, MUCH longer. You may not believe it, but the V1's battery lasted for three years. You heard it right: 3 years! It was bought in early November 2004. And the V4 is still running! Weird.
My V2, V3 and V4 did beep, and the latest version, the more battery power it uses, beacause it is more advanced! I don't think they are zombie tamas but good idea though!
Hope i helped, and have a great tama-talking day!!!
My snakeskin V3 has it. It is rather odd- I think it's the clock ticking and not the heartbeat, but it could be. Since my pink V2 lost it's sound, it dosen't. My V4.5 dosen't neither.