Special note: simultaneous dialing of two phones is not supported! Cord length: 16cm Jack gold pin: phosphor bronze, gold-plated Mating times: ≥800 times Working temperature:-10°C50C Applicable crystal head: 6P4C/6P2C Function description: 1. When an outside line is incoming, all phones will ring, and you can talk to an outside line when you pick up any phone. 2. When you need to dial an outside line, you can directly dial any phone. 3. During the call, whether other phones are off-hook or not will not affect the call status of the caller. 4. When you need to transfer to another phone during a call, you only need to put the phone to be called in off-hook state. 5. This splitter only provides distribution and does not have a call security function. When any phone is talking, other phones can be used. At the same time I heard. Note: The two-core telephone line can also be used normally when plugged into this thing, please rest assured to buy. Package includes: 1Pc x RJ11 to RJ11 Separator