E3 Headphone Amplifier

The E3 is a headphone amplifier, it is designed to improve the sound quality of MP3 and MP4 Players, Computers or Mobile Phones, when using earphones or headphones. 

It saves your player battery and lengthens the play time when playing music.

It’s not about Volume but Quality.

A great pair of headphones can change your listening experience--but only if they are driven well and properly powered. 

Put an E3 Headphone Amplifier between your music source and your favourite pair of headphones or earphones for an awesome personal listening experience right between your ears.

Features :

• Designed for high impendence and low sensitivity headphones, with bass boost function;
• Small and easy to carry and use in the outdoors;
• Increase your music player's play time;
• Uses only one AAA battery, for 20 hours playtime.

Specifications:

• Output Power 70 mW (32 ohms Loaded)
  12 mW (300 ohms Loaded)
• Signal to Noise Ratio >= 90 dB (A Weight)
• Distortion < 0.05% (10 mW)
• Frequency Response 10 Hz - 40 kHz
• Suitable Headphone Impedance 16 ohms - 300 ohms
• Weight 11 grams (without battery)
• Power Supply 1 AAA Battery
• Dimensions 55 mm x 23 mm x 14.5 mm

Reviews from the famous headphone forum 'Head-fi' 
http://www.head-fi.org/forums/f5/fiio-amps-323979/

Another detail & great REVIEW :

mY pHone.. :)

             A.p.p.l.e  i.P.h.o.n.e. 4S

Detail about iPhone 4s . .

GENERAL	2G Network	GSM 850 / 900 / 1800 / 1900
		CDMA 800 / 1900
	3G Network	HSDPA 850 / 900 / 1900 / 2100
		CDMA2000 1xEV-DO
	Announced	2011, October
	Status	Available. Released 2011, October

BODY	Dimensions	115.2 x 58.6 x 9.3 mm
	Weight	140 g

DISPLAY	Type	LED-backlit IPS TFT, capacitive touchscreen, 16M colors
	Size	640 x 960 pixels, 3.5 inches (~330 ppi pixel density)
	Multitouch	Yes
	Protection	Scratch-resistant glass, oleophobic coating

SOUND	Alert types	Vibration, MP3 ringtones
	Loudspeaker	Yes
	3.5mm jack	Yes

MEMORY	Card slot	No
	Internal	16/32/64 GB storage, 512 MB RAM

DATA	GPRS	Yes
	EDGE	Yes
	Speed	HSDPA, 14.4 Mbps; HSUPA, 5.8 Mbps
	WLAN	Wi-Fi 802.11 b/g/n, Wi-Fi hotspot
	Bluetooth	Yes, v4.0 with A2DP
	USB	Yes, v2.0

CAMERA	Primary	8 MP, 3264x2448 pixels, autofocus, LED flash, check quality
	Features	Touch focus, geo-tagging, face detection, HDR
	Video	Yes, 1080p@30fps, LED video light, video stabilization, geo-tagging, check quality
	Secondary	Yes, VGA, 480p@30fps, videocalling over Wi-Fi only

FEATURES	OS	iOS 5
	Chipset	Apple A5
	CPU	Dual-core 1 GHz Cortex-A9
	GPU	PowerVR SGX543MP2
	Sensors	Accelerometer, gyro, proximity, compass
	Messaging	iMessage, SMS (threaded view), MMS, Email, Push Email
	Browser	HTML (Safari)
	Radio	No
	GPS	Yes, with A-GPS support and GLONASS
	Java	No
	Colors	Black, White
		- MicroSIM card support only - Scratch-resistant glass back panel - Active noise cancellation with dedicated mic - Siri natural language commands and dictation - iCloud cloud service - Twitter integration - Google Maps - Audio/video player and editor - Image editor - Voice command/dial - TV-out

BATTERY		Standard battery, Li-Po 1432 mAh
	Stand-by	Up to 200 h (2G) / Up to 200 h (3G)
	Talk time	Up to 14 h (2G) / Up to 8 h (3G)
	Music play	Up to 40 h