Hitachi BTN1 Owner's Manual page 17

Specifications
Model Name
Speaker
Frequency response
Power amplifier
THD (Distortion Ratio)
SNR (Signal to Noise Ratio)
Sound pressure level
Play mode
Charging input
Battery
Dimensions
Weight
Bluetooth version
Bluetooth Range
Hands-free
Note: Specifications subject to change without notice
(Specifications subject to change without notice)
BTN1
1 x 2 inch full frequency speaker, 3W, 4ohm
120Hz-15KHz (+/- 3dB)
Class D @ 3 W × 1 CH
< 10% @ 500 mV/1kHz
> 75dB(A)
83dB ±3dB (500mV @ 1m)
Bluetooth/Line In
DC 5V,1A (Micro USB)
Lithium polymer battery/3.7V/1300mAh/4.81Wh
3 (W) x 3 (H) x 1-5/8 (D) inches;
7.5 (W) x 7.5 (H) x 4 (D) cm
0.4lbs (200g)
BT2.1+EDR
10m (Line of sight)
DSP MIC hands-free system
17