MK43mm & MK51 mm T1 Transmitter 

• Descent T2 Transceiver Battery Life: Up To 100 Hours Of Diving With A User-Replaceable CR123A Lithium Battery
• Compact Dive Accessory Attaches To High-Pressure Regulator Ports, Without Interference From Hoses
• Built To Withstand The Elements, The Descent T2 Transceiver Is Dive-Rated To 20 ATM
• Tank Pressure, Air Time Remaining And Air Consumption Rate Sent Directly To Paired Air-Integrated Descent Dive Computers