Type 2820 / 2825 diving Telephone & nbsp; Amcom Ⅱ diving intercom telephone is a communication equipment supporting two divers. Both have two-wire or four wire communication modes, and the two modes can be used together. The 2820 submersible telephone uses one switch to control the volume of two channels of communication, while the 2825 submersible telephone has two switches to control the volume of two channels of communication respectively. The weight of type 2820 diving telephone is 9.15kg, and that of type 2825 is 10.15kg. The overall dimensions are 362 × two hundred and twenty-five × 50mm。 Qs2720 diving intercom telephone is a portable underwater telephone for a single diver
