28MM Mylar speaker 8ohm 1W for Telecom Voip

28mm mylar speaker are waterproof, 28MM Round Shape 8Ohm 1watt 2W Full Range Loud Mylar Speaker with Cable and Connector for Audio Player

Item	Specification	Condition
Dimensions	φ28*5.4H mm
Nomial Impedance	8±15% OHM	At 1.0KHz / 0.89V
Input power	Rated:1W/Max:2W	At 2.83V / 4.0V
Resonance Frequency	710±20%Hz	At 0.89V
S．P．L．	94±3 dB(0.1W/0.1M)	At0.8K/1.0K/1.2K/1.5KHz (Average)
Frequency Range	F0~20K	Output S.P.L. -10dB
Distortion	5%Max	At 1.0KHz 0.1W/0.1M
Buzze & Rattle	Not be audible sine wave between at2.83V /200~5KHz.
Polarity	Diaphragm shall move forward.
Load test	Must be normal after load test: white noise 24 hours.
High TEMP test	After having been in a test chamber for 48 hours at the condition of +60 ℃
	20~25%R.H and keep 2 hours.
Cold TEMP test	After having been in a test chamber for 48 hours at the condition of －25℃±3℃
	and keep 2 hours.
Humidity test	After having been in a test chamber for 48 hours at the condition of +40 ℃
	90~95%R.H and keep 4 hours.
Weld	terminal weld: 350℃/≤2~3sec*2bit.
Store TEMP	－25℃ To +60℃