Are these powered by AAA batteries or do you have to plug them in to charge them?

They are rechargeable. I didn’t notice any battery access panel and assume it uses those little button rechargeable batteries like hearing aids. It comes with a USB to micro USB charging cable.

Are these headphones adjustable to fit different size heads?

Yes. Each side of the band adjusts in 1/8-inch increments, for a total of about an inch of adjustment for either side.

How do you replace the battery?

This has an inbuilt battery not a removable one. It's a rechargeable one which use a micro usb charger just like your cellphone to charge it. this is a goodone. I use it

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Philips Bluetooth Stereo On-Ear Black Headphone SHB4000/28 with microphone

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Ultra-lightweight
Savor clear, natural sound
32mm Neodymium Drivers
Bluetooth music

Overview

Specs

Reviews (6)

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Bluetooth Stereo Headset

Pure sound, wired or wireless. This headset features
superior drivers, and the digital enhancements deliver booming bass and clarity of sound.
Deluxe FloatingCushions allow fully multi-directional adjustment of the earshells - definitely ideal for pleasurable listening, wired or wirelessly.

Highlights

Premium Sound Quality

Digital enhancement reveals hidden notes and nuances
Superior speakers deliver high performance sound

Made to Fit You and Your Lifestyle

Sound isolating super soft ear cushions
Natural, comfortable fit from deluxe memory-foam
Integrated slim headband design

Clear Communication

Digital noise reduction for clearer calls

Free from Hassle

Change volume, track, and toggle control with mic for easy music & call switching

Universal: Works with Devices with Bluetooth or 3.5mm Jack

Bluetooth Stereo HSP / HFP / A2DP compliant
Choice of wireless or wired listening

Features

Sound-Isolating Super Soft Ear Cushions

The deluxe super soft ear cushions enable you to wear your headphones for as long as you like without discomfort.

Natural & Comfortable Fit from Deluxe Memory-Foam FloatingCushions

The newly innovated, deluxe FloatingCushions design of these Philips headphones allows for full multi-directional, auto-adjustment of the cushions, without the need of the traditional C-hinge construction. This results in a seamless design, which ensures optimum stability by applying an evenly distributed pressure force onto the user's head and ears.

Digital Enhancement Reveals Hidden Notes and Nuances

Booming & superior bass from high performance drivers and digital enhancements.

Integrated Slim Headband Design

Integrated slim headband design delivers optimum usability

Volume, Track, and Toggle Control with Mic for Music & Calls

Easily switch between music and calls with smart controls (volume, track and toggle control)

Choice of Wireless or Wired Listening

Use as a Bluetooth wireless headphone or listen via 3.5mm plug-in option.

Bluetooth Stereo HSP / HFP / A2DP Compliant

Bluetooth is a cable replacement technology. Bluetooth is a global standard, so Bluetooth devices of different manufacturers can incorporate using shared Bluetooth profiles. HSP (Headset Profile) and HFP (Handsfree Profile) are the profiles required for typical Bluetooth headset operations. If your mobile phone is compliant to HSP or HFP, this headset will work perfectly with it.

Brand	PHILIPS
Model	SHB4000/28

Type	On-Ear
Color	Black
Driver Unit	32mm
Frequency Response	20-20,000 Hz
Input Impedance	24 ohms
Sensitivity	100 dB/mW
Ear Coupling	Over-the-head
Wireless Type	Bluetooth