Features: 1. Equipped with a large speaker with high volume and clear sound; 2. The circular auricle is fixed, not easy to fall off, suitable for sports, outdoor and more scenes; 3. The ear hook material is soft and comfortable to wear; 4. Sound acts on the ear canal without entering the ear, making it more hygienic; Specifications: Speaker size 20mm Speaker specification 32 ohms Speaker sensitivity 108dB Frequency response 20-4KHz Rated input power 10mW Microphone parameter -40+/-3dB at 6.0x5.0 Microphone impedance 2200Ohm Working voltage 2-10V Weight 38g Compatible with KPG: KPG27D, KPG29D,KPG48D,KPG49,KPG55D,KPG56D,KPG62D,KPG66D,KPG69D,KPG70D,KPG74D,KPG75D,KPG77D,KPG82D,KPG87D For Jianwu TH: TH-D7, TH-D7A,TH-D7AG,TH-D7E,TH-F6,TH-F6A,TH-F7,TH-F7E,TH-G71,TH-G71A,TH-G71E,TH- K2,TH-K2A,TH-K2E,TH-K2ET,TH-21,TH-21AT,TH-21BT,TH-22,TH-22A,TH-22AT,TH-22E,TH-25,TH-26, TH-27,TH-28,TH31AT,TH31BT,TH41AT,TH41BT,TH-42,TH-42A,TH-42AT,TH-42E,TH-45,TH-46,TH-47,TH-48,TH- 55,TH-75,TH-77,TH-G71,TH-205,TH-215,TH-225,TH-235,TH-235A,TH-235E,TH-315,TH-415 For Jianwu TK: TK-208/308, TK-220 / 320,TK-240 / 340,TK-240D / 340D,TK-248 / 348,TK-250 / 350/353,TK-260 / 360,TK- 260G / 360G,TK-270 / 370,TK-270G / 370G,TK-272G / 372G / 373G,TK-278G / 378G / 388GPro-Talk,TK-430 / 431,TK-2100 / 3100Pro-Talk,TK- 2102 / 3102Pro-Power,TK-2107 / 3107Pro-Talk,TK2207,TK3207,TK-2160 / 3160 For Baofeng: UV5R, BF-480 / 490/320 / V6 / V7 / V8 / 658/520/530/999/888/777 / 666S / 777S / 888S For Retevis: H777 RT5R RT5RV RT1 RT2 RT5 RT3 RT3S RT7 RT81 RT22 RT24 RT25 RT26 RT27 RT80 RT28 RT28P RT50 RT84 RT15 RT17 RT617 RT61 RT51 RT52 RT46 RT18 RT618 RT53 RT19 RT619 RT66 RT666 RT67 RT68 RT668 RT69 RT669 RT43 RT76 RB18 RB618 RT85 RB35 RB635 RA16 RA616 RT86 RB37 RB637 RB25 RT10