Pioneer TS-R1651D Coaxial Speaker (Black)

Long Battery Life : Battery life up to 16 hours for long listening hours
Extra Bass : Get things going with EXTRA BASS. A passive radiator works with the mono speaker to enhance low-end tones, giving bass a boost despite the compact size
Totally waterproof : With an IP67 rating, the speaker can survive being dropped in water, so the odd rain shower or accidental spillage won’t pose any problems.
Totally dustproof : Thanks to the IP67 rating, you can take your speaker to the pool or wherever you like. The speaker will keep on playing, no matter how dusty the surface.
Built-In Mic : Built-in mic for hands free calling
Usage : Supplied detachable strap for easy ususage
Small and light design : The SRS-XB12 is compact, wireless and made to go with you anywhere. With a detachable strap you can easily hang it up and keep your music going on the move.

150 watts Max power (50 watts nominal)
Hvt stands for horizontal vertical transforming technology which transforms horizontal movement into vertical movement of a woofer diaphragm to produce true, powerful and wide-range bass.
Significantly reduced physical depth, while maintaining greater excursion and linearity for superior bass reproduction, natural sound quality and higher output.
Subwoofer will fit easily in a wide range of vehicle applications (Compact and subcompact vehicles, hybrid vehicles, trucks and SUVs, etc.)
Impedance 4 ohms/ frequency response 20 Hz to 200 Hz