Here is verse one :
Ὃ ἦν ἀπ’ ἀρχῆς, ὃ ἀκηκόαμεν, ὁ ἑωράκαμεν τοῖς ὀφθαλμοῖς ἡμῶν, ὃ ἐθεασάμεθα καὶ αἱ χεῖρες ἡμῶν ἐψηλάφησαν περὶ τοῦ λόγου τῆς ζωῆς—.
I'm looking at the prepositional phrase at the end of verse 1 and have come to the conclusion that ζωῆς is an epexegeical genitive, so that it is "oppositional" to λόγου. Thus the correct translation here of bold above is " [I am] referring to the word, that is, the life."
Also at the end of verse 3 I see another epexegetical genitive:
ὃ— ἑωράκαμεν καὶ ἀκηκόαμεν, ἀπαγγέλλομεν καὶ ὑμῖν, ἵνα καὶ ὑμεῖς κοινωνίαν ἔχητε μεθ’ ἡμῶν. καὶ ἡ κοινωνία δὲ ἡ ἡμετέρα μετὰ τοῦ πατρὸς καὶ μετὰ τοῦ υἱοῦ αὐτοῦ Ἰησοῦ Χριστοῦ.
So above (in bold) is to be translated "with his son, that is, Jesus Christ."