OTS PowerCom 3000D, 4 Channel (25 Watts Output Power) Features: Nominal Range : 3000m* Channels: 1 - 4 Channel Selection: Voice menu Output Power (watts): 25 Microphone/Speakers: Requires a separate Ear/Microphone Assembly Transmit Control: PTT / VOX Maximum Depth: 300 fsw Battery Type: Lithium-Ion Rechargeable Battery Battery Life (10% duty cycle): 14 Hours Dimensions (H x W x D): 7.0 x 4.2" x 2.65" Weight: 2.2lbs The POWERCOM 3000D Wireless Diver Communication Unit takes Wireless Communication performance to the next level for all your professional diving needs. It&';s specifically designed rechargeable Lithium-ion battery boasts more power for improved range, up to 14 hour battery charge and significantly improved overall battery lifespan ensuring that the PowerCom 3000D will keep you connected when you need it. Looking for added communication security? Look no further. With the POWERCOM 3000D's all-new Scrambler Mode, Wireless Communications can now be discreetly and more securely transmitted for the first time in wireless communication history. Tack on additional features such as "Extra Loud" Voice Menu Volume Control, improved mounting and strain reliefs, and more replaceable components for serviceability, the POWERCOM 3000D is truly the next generation of Wireless Diver Communications.